0.87 H. W.F. H. Shimer, The Lithological Section of Walnut Canyon Arizona with Relation to the Cliff-Dwellings of This and Other Regions of Northwestern Arizona, American Anthropologist, 1910.

{ found feet stone small }	0.87
{ fig made found figure }	0.04
{ paleolithic upper stone tools }	0.03
{ number data group table }	0.02