On germinal selection as a source of definite variation Weismann, August, 1834-1914 creator text book Chicago The Open court publishing company 1902 1902 2d ed.
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ENG GER Heredity Variation (Biology) QH401 .W4 1902 https://www.biodiversitylibrary.org/bibliography/3743 4349871 10.5962/bhl.title.3743 EEM