TY  - SER
AU  - Bates Graber, Robert.
TI  - Population pressure, agricultural orins, and cultural evolution : : Constrained mobility or inhibited expansion?
T2  - American Anthropologist ; 
PY  - 1991///
CY  - Washington, DC : 
PB  - American Anthropological Association, 
N1  - Articulo dentro de commentaries
ER  -