0.33 Robert C. Bailey Genevieve Head Mark Jenike Bruce Owen Robert Rechtman Elzbieta Zechenter, Hunting and Gathering in Tropical Rain Forest: Is It Possible?, American Anthropologist, 1989.

{ forest plant plants species }	0.33
{ population agricultural land agriculture }	0.17
{ university press american pp }	0.14
{ archaeological archaeology sites american }	0.07