0.22 J Carlton Snook B. K. Swartz_ Jr., An over Extension of the Mud-Flats Hypothesis? A Comment on the Struever-Vickery Hypothesis, American Anthropologist, 1975.

{ archaeological archaeology sites american }	0.38
{ forest plant plants species }	0.22
{ population agricultural land agriculture }	0.13
{ fact point evidence anthropologist }	0.09