0.48 David B. Eyde Paul M. Postal, Avunculocality and Incest: The Development of Unilateral Cross-Cousin Marriage and Crow-Omaha Kinship Systems, American Anthropologist, 1961.

{ kinship terms descent term }	0.48
{ fact point evidence anthropologist }	0.11
{ social group groups political }	0.10
{ data sample variables societies }	0.09