Spermatogenesis and fecundation of Zamia.
Bulletin (United States. Bureau of Plant Industry) ; no. 2.
Webber, Herbert John, 1865-1946
United States. Department of Agriculture.
United States. Bureau of Plant Industry.
Washington :U.S. G.P.O.,1901.
At head of title: U.S. Department of Agriculture. Bureau of Plant Industry ...
Issued also as the author's thesis (PH. D) Washington University, St. Louis, 1901.
NAL: 1 P69B no. 2 1901
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