TY  - BOOK
AU  - DeFries, Ruth
TI  - The Big Ratchet: 
SN  - 978-0-465-04497-9
AV  - GF75.D44 
CY  - New York
KW  -  Human evolution
KW  -  Physical anthropology
KW  -  Social evolution
KW  - Anthropogeography
KW  - Human ecology
ER  -