Books by O. B. Martin:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Martin, O. B. (Oscar Baker), 1870-1935: A decade of negro extension work, 1914-1924 (Gutenberg ebook)- Martin, O. B. (Oscar Baker), 1870-1935: The demonstration work; Dr. Seaman A. Knapp's contribution to civilization (The Stratford co., 1921) (page images at HathiTrust)
- Martin, O. B. (Oscar Baker), 1870-1935: Girls' demonstration work: the canning clubs ... ([Govt. print. off.], 1913), also by United States. Bureau of Plant Industry and I. W. Hill (page images at HathiTrust)
Find more by O. B. Martin at your library, or elsewhere.