Books by Howard J. Dittmer:
Books in the extended shelves:
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Dittmer, Howard J. (Howard James), 1910-: The developmental anatomy of Descurainia pinnata ochroleuca (Woot.) Detling (Univ. of New Mexico Press, 1947), also by Robert D Spensley (page images at HathiTrust)- Dittmer, Howard J. (Howard James), 1910-: The ferns and fern allies of New Mexico (University of New Mexico Press, 1954) (page images at HathiTrust)
Find more by Howard J. Dittmer at your library, or elsewhere.