Author:
Dobzhansky, Theodosius, 1900-1975.
Imprint:City of Washington : The Smithsonian institution, 1941.
Description1 p. l., 94 p. 6 pl. on 3 l. ; 25 cm.
Note:Publication 3642.
Note:At head of title: Thomas Lincoln Casey fund.
Bibliography Note:"Literature cited": p. 90-92.