0.44 Joseph Brennemann, The Sacral or So-Called "Mongolian" Pigment Spots of Earliest Infancy and Childhood with Especial Reference to Their Occurrence in the American Negro, American Anthropologist, 1907.

{ skull teeth index head }	0.44
{ found feet stone small }	0.09
{ fact point evidence anthropologist }	0.07
{ man primitive human great }	0.07