TY  - BOOK
AU  - Darwin,Charles Robert
AU  - Tripp,Newell R
TI  - The substance of The descent man
U1  - 575 
PY  - 1926///
CY  - New York
PB  - Vanguard Press
KW  - Evolution (Biology)
KW  - Natural selection
KW  - Sexual dimorphism (Animals)
KW  - Human beings
KW  - Origin
ER  -