TY  - BOOK
AU  - Schmalhausen I I
AU  -  Dobzhansky Theodosius Ed.
AU  -  Dordick Isadore Tr.
TI  - Factors of evolution
U1  - G:66, H9;1 
PY  - 1949///
CY  - Philadelphia
PB  - Blakiston         
KW  - Biology
ER  -