Ridgley, Douglas C. (Douglas Clay), 1868–
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- Open Library: OL161289A
- pdbooks.info ID: 9027
Douglas C. (Douglas Clay) Ridgley Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
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| Geographic principles | 1925 | Author | |  | |  | | ||
| The geography of Illinois | 1921 | Author | | | | | |    
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| Home geography: a textbook for pupils, based on the Illinois state course of study | 1915 | Author | | | |  | |
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| How to study and teach eighth year geography: a pamphlet for teachers and pupils | 1911 | Author | | | | | | ||
| South America and Europe: a reference notebook for pupils to accompany any textbook in geography | 1917 | Author | | | | | | ||
| A study of children's learning about places | 1928 | Author | | | | | | ||
| Teachers' guide for the use of the "600 set" of Keystone stereographs and lantern slides for visual instruction | 1911 | Author | | | | | |
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