Gruber, Karl, 1881–1927
Nationality: Undetermined, possibly 
(Germany)
Identities and Authority Control
- pdbooks.info ID: 47182
Karl Gruber Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
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| Okkultismus und Biologie: gesammelte Aufsätze aus dem Nachlass | 1929 | Author | |  |  | | | ||
| Parapsychologische erkenntnisse | 1925 | Author | | | | | | ||