Books by Robert Glenn Mower:
Books in the extended shelves:
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Mower, Robert Glenn, 1928-: Vegetative keys to common ornamental woody plants (Dept. of Floriculture and Ornamental Horticulture, New York State College of Agriculture, ... Cornell University, 1964), also by Ralph W. Curtis, John Farnsworth Cornman, and New York State College of Agriculture. Department of Floriculture and Ornamental Horticulture (page images at HathiTrust)
Find more by Robert Glenn Mower at your library, or elsewhere.