0.22 Clarence C. Gravlee H. Russell Bernard William R. Leonard, Heredity Environment and Cranial Form: A Reanalysis of Boas's Immigrant Data, American Anthropologist, 2003.

{ skull teeth index head }	0.22
{ data sample variables societies }	0.16
{ anthropology anthropologists human research }	0.14
{ number data group table }	0.14