| Title | Edition | Year of Publication | Contributors | Country of Publication | Possible Copyright Status | Available Online? |
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| ... A practical faith | | 1926 | Harold Anson | |  | |  | |
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| Adolescent worship | | 1929 | Gerrit Verkuyl | | | | | |
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| The art of group worship | | 1938 | Paul H. (Paul Herman) Vieth, Robert Seneca Smith | |  | | | |
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| The art of living | | 1933 | Bhagwan Singh Gyanee | | | | | |
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| Askese und erotik | | 1926 | Rosa Obermayer Mayreder |  | | | | |
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| Bacon-Gamble ancient and modern fixed date calendars | | 1928 | Samuel Walter Gamble, Alexander S. (Alexander Samuel) Bacon | | | | | |
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| Baptême et confirmation | | 1928 | Adhémar d' Alès |  | | | | |
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| Baptême et confirmation | | 1929 | Raoul Plus | | | | | |
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| The baptism with the Holy Spirit | | 1925 | Oswald J. Smith | | | | | |
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| Baptismal regeneration | | 1936 | Andrew Judson Murphy | | | | | |
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| A beginner's book of yoga | | 1937 | David Merrill Bramble, L. Adams (Lily Adams) Beck | | | |  | |
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| Bible baptism (2d and enl. ed.) | | 1925 | Stephen Marcus Lindsey | | | | | |
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| The bridge over the world: a commentary on the mass | | 1935 | Domenico Giuliotti | | | | | |
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| The burden of ill-health, how to bear it | | 1894 | Leila Lyon. Topping | | | | | |
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| Calvary and the mass | | 1936 | Fulton J. (Fulton John) Sheen | | | | | |
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| A catechism in Christian worship | | 1927 | Calvin Peter Swank | | | | | |
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| A child's way of the cross | | 1928 | Mary Dixon Thayer | | | | | |
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| Christian public worship | | 1928 | Thomas Leonard Harris | | | | | |
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| Christian worship and its future: five lectures delivered at Ohio Wesleyan University | | 1927 | G. A. Johnston (George Alexander Johnston) Ross | | | | | |
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| The collegiate tribunal of first instance: with special reference to matrimonial causes | | 1932 | Avitus Edward Lyons | | | | | |
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| Complete yoga | | 1937 | rishi Singh Grewal | | | | | |
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| Creative worship | | 1931 | Dwight J. (Dwight Jaques) Bradley | | | | | |
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| Cyclopedia of funeral sermons and sketches | | 1926 | G. B. F. (Gerard Benjamin Fleet) Hallock | | | | | |
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| Das heilige messopfer | | 1934 | Alphons Maria Rathgeber | | | | | |
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| De Sacrosancto Missae Sacrificio Libri Tres | | 1755 | Pope Benedict XIV |  | | | | | 
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| The defensor vinculi: his rights and duties | | 1934 | John Leo Dolan | | | | | |
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| Dell' influenza dell' ascetismo medievale sulla lirica amorosa del dolce stil nuovo. | | 1900 | Gellio Cassi | | | | | |
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| Demons and tongues | | 1919 | Alma White | | | | | |
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| Der Heiland am Krankenbett: vertrauliche Unterredungen voll Kraft und Trost, den lieben Kranken gewidmet | | 1934 | Leo Schlegel, Elena Guerra |  | | | | |
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| Der mystische leib Christi | | 1929 | Hugo Lang | | | | | |
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| Devotional leadership: private preparation for public worship | | 1925 | Gerrit Verkuyl | | | | | |
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| Did Jesus command immersion?: an exhaustive study of the word "baptize," | | 1915 | J. Gilchrist (James Gilchrist) Lawson | | | | | |
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| Die heilige messe in ihrem werden und wesen | | 1932 | Johannes Brinktrine | | | | | |
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| A dramatic service of worship: how it grew | | 1935 | Catharine Mary Conradi | | | | | |
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| The Duk-Duks: primitive and historic types of citizenship | | 1929 | Elizabeth Anne. Weber | | | | | |
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| The ecclesiastical prohibition of books | | 1932 | Reverend Joseph M. Pernicone, Joseph Maria Pernicone | | | | | |
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| Esoteric Cosmic yogi science | | 1929 | Sabhā-pati Svāmi, William Estep | | | | | |
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| The eternal sacrifice | | 1932 | Louise Doran Ross | | | | | |
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| Ethics of ectopic operations | | 1933 | T. Lincoln (Timothy Lincoln) Bouscaren | | | | | |
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| Eucharist and penance in the first six centuries of the church | 2d German ed. | 1913 | Gerhard Rauschen | | | | | |
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| Eucharistia | | 1926 | His Grace, Joseph Kramp, William Busch | | | | | |
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| The eucharistic sacrifice | | 1930 | Bernard Vincent Miller |  | | | | |
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| The eucharistic sacrifice | | 1930 | Bernard Vincent Miller | | | | | |
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| Except ye repent | | 1937 | H. A. (Henry Allan) Ironside | | | | | |
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| Fakire und fakirtum im alten und modernen Indien | | 1907 | Richard Schmidt | | | | | |   
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| Fakirs et yogis des Indes | | 1936 | Edmund Demaitre | | | | | |
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| Following Christ through the mass | | 1935 | | | | | | |
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| Form of baptism explained: the fruit of a prayerful study during many years | | 1935 | Menno Borduin | | | | | |
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| Forty-eight primary worship services: programs with songs, scriptures, stories an things to do | | 1932 | Caroline Kellogg | | | | | |
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| Frequent journeys to Calvary | | 1935 | P. J. Buissink | | | | | |
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| From Passover to Pentecost | | 1934 | Joseph Hillary King | | | | | |
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| From Sabbath to Sunday | | 1933 | Paul Cotton | | | | | |
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| Geschichte der Messe | | 1913 | Peter Wagner | | | | | |
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| Gonzalo de Berceo: El sacrificio de la misa, a study of its symbolism and of its sources | | 1933 | Teresa Clare Goode | | | | | |
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| Grundriss der aszetischen und mystischen Theologie | | 1931 | Adolphe Tanquerey, Johannes Sternaux | | | | | |
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| Guiding the experience of worship | | 1935 | Erwin L. (Erwin Leander) Shaver, Marie Cole Powell | | | | | |
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| Higher psychical development (Yoga philosophy) an outline of the secret Hindu teachings | | 1920 | Hereward Carrington | | | | | |
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| The Hindu-Aryan theory on evolution and involution: or, The science of raja-yoga | | 1908 | Tirumangalum Chrishna | | | | | |
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| A history of Christian worship | | 1937 | O. (Oscar) Hardman | | | | | |
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| History of the Sabbath and the first day of the week | 4th ed., rev. and enl. | 1912 | John Nevins Andrews, L. E. Conradi | | | | | |
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| The holy hour: a series of conferences | | 1912 | William Graham | | | | | |
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| Holy mass: an explanation of the spiritual and doctrinal meaning of the mass and its ceremonies | | 1932 | Winfrid Herbst, Guglielmo Reyna, Ottilie Boediker | | | | | |
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| The holy sacrifice of the mass | | 1928 | Martin J. (Martin Jerome) Scott | | | | | |
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| The hour of prayer, KTAB | | 1928 | Geo. W. (George Wallace) Phillips | | | | | |
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| How to plan informal worship | | 1955 | Winnifred Wygal | | | | | |
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| Immateria medica: a collection of prayers for the use of the sick and those who minister to the sick | | 1934 | Thomas Chalmers Marshall | | | | | |
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| In defense of magic: the meaning and use of symbol and rite | | 1930 | Catharine Cook. Smith | | | | | |
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| In the shadow of death; meditations for the sick-room and at the death-bed | | 1929 | Abraham Kuyper, John Hendrik De Vries | | | | | |
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| Indische Sphären | | 1935 | Heinrich Robert Zimmer | | | | | |
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| Infant-baptism: historically considered | | 1916 | William Joseph McGlothlin | | | | | |
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| Influence of the weekly rest-day on human welfare: a scientific research | | 1927 | D. J. (Duncan James) McMillan | | | | | |
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| An introduction to Yoga | | 1933 | Claude Fayette Bragdon | | | | | |
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| Junior assembly programs | | 1935 | Mrs Ethel (Harrison) Grice | | | | | |
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| Junior worship guide: of special value to schools using the Church school closely graded courses; a bird's-eye view of the three junior courses, their objectives, activities, memory work and related worship materials as suggested in the pupil's and teacher's textbooks; with sample worship services indicating how these materials may be used in departmental worship programs | | 1930 | | | | | | |
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| The jurisdiction of the confessor according to the code of cannon law | | 1929 | Rt. Rev. Msgr, James Patrick Kelly | | | | | |
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| The jurisdiction of the simple confessor | | 1927 | James Patrick Kelly | | | | | |
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| The kingdom within | | 1937 | Stella Flowers Hastings | | | | | |
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| Kort begrip der ascetische en mystieke theologie | | 1932 | Adolphe Tanquerey, Gonzaga Gouverneur | | | | | |
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| Kundalini: the mother of the universe, the mystery of piercing the six chakras | | 1930 | rishi Singh Grewal | | | | | |
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| L'église et la rémission des péchés aux primiers siècles | | 1932 | Paul Galtier | | | | | |
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| La messe | | 1927 | Joseph Turmel | | | | | |
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| La messe en occident | | 1932 | Fernand Cabrol | | | | | |
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| La prière des premiers chrétiens | | 1929 | Fernand Cabrol | | | | | |
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| Le cardinal de Bérulle | | 1933 | Pierre de Bérulle, Claude Taveau | | | | | |
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| Legislacíon de la iglesia sobre la intención en la aplicación de la santa misa: Breve sinopsis histórica y comentario canónico | | 1931 | | | | | | |
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| Li gi: das buch der sitte des älteren und jüngeren Dai; aufzeichnungen über kultur und religion des alten China | | 1930 | Richard Wilhelm | | | | | |
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| The life beyond death | | 1912 | Yogi Ramacharaka | | | | | |
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| The light of the soul, its science and effect: a paraphrase of the Yoga sutras of Pantanjali | | 1927 | Alice Bailey | | | | | |
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| The literary policy of the Church of Rome exhibited: in an account of her damnatory catalogues or indexes, both prohibitory and expurgatory. With various illustrative extracts, anecdotes, and remarks | 2d ed, much enl. | 1830 | Joseph Mendham | | | | | |
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| The liturgical sacrifice of the new law | | 1926 | Leo Francis Miller, Joseph Kramp | | | | | |
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| The liturgy of the Mass | | 1936 | Pius Parsch | | | | | |
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| Make your church attractive | | 1925 | Charles H. (Charles Herbert) Richards | | | | | |
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| Manual for training in worship | | 1915 | Hugh Hartshorne | | | | | |
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| A Manual of the ceremonies of low mass | | 1920 | L. (Lester Henry) Kuenzel | | | | | |
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| The mass | | 1921 | P. C. (Peter Christopher) Yorke | | | | | |
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| The mass; a laboratory manual for the student of religion | | 1930 | Raymond James Campion, Ellamay Horan | | | | | |
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| The mass explained to children | | 1932 | Maria Montessori | | | | | |
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| Mass stipends | | 1926 | Charles Frederick Keller | | | | | |
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| The mass-drama: an outline of its structure | | 1930 | William Busch | | | | | |
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| The mass-liturgy: litugical lectures on the sacrifice of the mass and the participation of the laity | | 1932 | Charles Cannon, Fidelis Böser | | | | | |
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| The Mass | | 1932 | John Steven McGroarty | | | | | |
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| Meditations for the sick | | 1937 | Russell Leslie Dicks | | | | | |
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| Messbuch des neuen menschen | | 1931 | Elisabeth von Schmidt-Pauli | | | | | |
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| The mind of the missal | | 1929 | C. C. (Cyril Charlie) Martindale | | | | | |
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| The mind of the missal | | 1929 | C. C. (Cyril Charlie) Martindale | | | | | |
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| The ministry of worship: a study of the need, psychology and technique of worship | | 1927 | William S. Lockhart | | | | | |
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| Modern man's worship: a search for reality in religion | | 1934 | Bernard Eugene Meland | | | | | |
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| Modern worship | | 1927 | Von Ogden Vogt | | | | | |
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| The mysterious kundalini: the physical basis of the "Kundali (Hatha) yoga" in terms of western anatomy and physiology | | 1929 | Vasant Gangaram Rele, Sir John Woodroffe |  | | | | |
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| The new interpretation of the mass | | 1933 | Henry Borgmann | | | | | |
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| The Oliphant-Rice debate on 1. Return of the Jews to Jerusalem, 2. Personal reign of Christ at Jerusalem, 3. Baptism for remission of sins, 4. Apostasy | | 1935 | W. L. (William Landon) Oliphant, Misses Maudelle Stramler, Blanchie Burton | | | | | |
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| One God: the ways we worship Him | | 1944 | Florence Mary Fitch | | | | | |
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| The original calendar of thirteen months of twenty-eight days each, called Ancient calendars | | 1928 | Samuel Walter Gamble, Alexander S. (Alexander Samuel) Bacon | | | | | |
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| The pastor in the sickroom: a handbook of lessons and prayers for the visitation of the sick | | 1912 | Charles Dietrich August Frederick Abbetmeyer | | | | | |
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| The pastor's pocket manual for hospital and sickroom | | 1949 | Edmond Holt. Babbitt | | | | | |
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| Patanjali's raja yoga: a revelation of the science of yoga | | 1935 | Rishi Singh Gherwal, Patañjali. | | | | | |
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| The poetry of the mass | | 1927 | George Joseph Donahue | | | | | |
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| Pour mieux entendre la messe: La Vierge et le sacrifice, dans le temple, à Nazareth, au cénace, au Calvaire, sur nos autels | | 1935 | François. Bouchage | | | | | |
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| Powers that be | | 1934 | Sir Alexander Cannon | | | | | |
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| Practical ascetics: for the use of seminarians, novices religious, priests, and the laity | | 1928 | Matthew J. W. Smith | | | | | |
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| Practical manual for marriage cases | 2d ed. | 1947 | William J. (William Joseph) Doheny | | | | | |
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| The practice and experience of Christian worship: a study of Biblical and ecclesiastical worship practices with especial reference to the origin and development of the worship service of Episcopal Methodism | | 1929 | Fitzgerald Sale Parker | | | | | |
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| Prayer and worship | | 1938 | Douglas V. (Douglas Van) Steere | | | | | |
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| Prayers of self-realization | | 1936 | Swami Premananda | | | | | |
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| Praying the mass: a study of the prayers and ceremonies of the holy sacrifice | | 1934 | John Joseph Butler, Mrs Angela (Aaron) Clendenin | | | | | |
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| Prescriptions, to be taken immediately, to be taken for life: a collection of extracts from Dr. Richard C. Cabot's "What men live by," selected by Edith Motter Lamb | | 1915 | Edith Motter Lamb, Richard C. (Richard Clarke) Cabot | | | | | |
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| The priest at the altar: an historical, liturgical and devotional explanation of the mass according to the Roman missal | | 1926 | Ernest Graf | | | | | |
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| The priesthood of the laity | | 1927 | G. Vale (George Vale) Owen | | | | | |
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| The quest for experience in worship | | 1929 | Edwin Hallock Byington | | | | | |
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| Religious ceremonies and customs: or, The forms of worship practised by the several nations of the known world, from the earliest records to the present time; on the basis of the ... work of Bernard Picart. To which is added, a brief view of minor sects which exist at the present day | | 1841 | William Burder, Bernard Picart | | | | | |
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| Religious fanaticism: extracts from the papers of Hannah Whitall Smith | | 1927 | Ray Strachey, David Eugene Smith, Hannah Whitall Smith | | | | | |
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| Reply to Canright: the truth about Seventh-day Adventists | | 1933 | William Henry Branson | | | | | |
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| Rest days: a study in early law and morality | | 1916 | Hutton Webster | | | | | |
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| Retours en chrétienté: la naissance, le mariage, la mort | | 1933 | Paul. Doncoeur | | | | | |
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| The Roman index of forbidden books briefly explained | | 1925 | Francis S. (Francis Sales) Betten | | | | | |
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| The Roman index of forbidden books briefly explained for Catholic booklovers and students | | 1909 | Francis S. (Francis Sales) Betten | | | | | |
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| The royal road of the holy cross | | 1937 | Jean Robin, C. Bosseron Chambers, Marie Roberts Glover | | | | | |
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| Rural people at worship | | 1943 | Edward Krusen Ziegler | | | | | |
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| Russell-White debate: a public discussion | | 1908 | C. T. (Charles Taze) Russell, L. S. (Lloyd Smith) White | | | | | |
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| The Sabbath in divine revelation and human history | | 1928 | George Arthur Main | | | | | |
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| The sacrament of baptism | | 1934 | James Merriam Howard | | | | | |
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| The sacrament of penance | | 1929 | Henry Harrington | | | | | |
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| The sacrament of penance | | 1929 | Henry Harrington, Very Reverend John F. Fenlon | | | | | |
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| Sacraments and society: a study of the origin and value of rites in religion | | 1924 | Allan Worthington Cooke | | | | | |
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| A search in secret India | | 1934 | Paul. Brunton | | | | | |
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| Secret key to health and prana | | 1922 | yogi Wassan | | | | | |
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| The sentence in ecclesiastical procedure: an historical synopsis and commentary | | 1934 | Delisle Antoine Lemieux | | | | | |
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| A series of eleven lessons in karma yoga (the yogi philosophy of thought-use) and the yogin doctrine of work | | 1928 | Bhikshu, Bhikshu (pseudonym) | | | | | |
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| A service book | | 1935 | Charles Carroll Albertson | | | | | |
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| The soul of America: a constructive essay in the sociology of religion | | 1914 | Stanton Coit | | | | | |
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| The strap returns: new notes on flagellation | | 1933 | Samuel Julian Wegman, Sidney Frank | | | | | |
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| Tender bottoms: a psychosexual study in morals, based on personal experiences and documentary evidence | | 1934 | Doctor Pierre Guenoles, Pierre Guénolé | | | | | |
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| The three baptisms and the three Sabbaths: the baptism and the Sabbath Christ instituted | | 1925 | Wm. Christie Smith, William Christie Smith | | | | | |
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| Thy health shall spring forth: readings in religion and health | | 1945 | Russell Leslie Dicks | | | | | |
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| Wallace-Stauffer debate | | 1937 | Miss Crystal Norfleet, Ezra Eugene Stauffer, Gervias Knox. Wallace | | | | | |
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| Water baptism: a pagan and Jewish rite, but not Christian; proven by Scripture and history, confirmed by the lives of saints who were never baptized with water | | 1902 | James H. Moon | | | | | |
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| We worship: services of worship for the small church school | | 1930 | Ruth Irwin Rex., Mrs Ruth Irwin Rex | | | | | |
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| What men live by: work, play, love, worship | | 1914 | Richard C. (Richard Clarke) Cabot | | | | | |
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| Wieland | | 1926 | Fred Lewis Pattee, Charles Brockden Brown | | | | | |
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| Wieland | | 1958 | Charles Brockden Brown | | | | | |
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| Words of cheer and comfort | | 1907 | Willard F. (Willard Francis) Mallalieu | | | | | |
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| A working faith | | 1926 | Charles Reynolds Brown | | | | | |
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| Worship | | 1936 | Evelyn Underhill | | | | | |
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| Worship for youth: a year of worship programs for young people | | 1928 | Gussie Brown Stacy | | | | | |
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| Worship in the church school | | 1930 | John Sherman Wallace | | | | | |
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| Worship training for primary children | | 1929 | Mrs Clara Beers Blashfield | | | | | |
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| Worship | | 1937 | Evelyn Underhill | | | | | |
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| Worshipping toward Christian unity: a study and exposition of the devotional approach to Chriatian unity | | 1930 | John B. (John Brandon) Cowden | | | | | |
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| Yoga: a scientific evaluation | | 1937 | Kovoor Thomas Behanan | | | | | |
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| The Yoga aphorisms of Patanjali: an interpretation | | 1912 | William Quan Judge, J. H. (James Henderson) Connelly, Patañjali. | | | | | |
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| Yoga i dens betydning for Europa | | 1916 | Johannes Edouard Hohlenberg | | | | | |
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| Yoga; its problems, its philosophy, its technique | | 1930 | Franklin Fowler Wolff | | | | | |
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| Yoga lessons for developing spiritual consciousness | | 1911 | Swami A. P. Mukerji | | | | | |
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| The yoke made easy | | 1935 | Alfred Doerffler | | | | | |
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Public Domain Books