"two-memoranda-on-social-organization-and-adaptive-selection-in-a-northern-plains-region" . "Two memoranda on social organization and adaptive selection in a Northern Plains region"^^ . . "8" . "238-248" . "1963"^^ . . . _:genid1 . _:genid1 . _:genid1 . _:genid1 . _:genid2 . _:genid2 . _:genid2 . _:genid2 . . . . .