An indian hunters' camp for 20,000 years : a rock shelter in western Pennsylvania was periodically occupied from about 19,000 B.C to A.D 1000 The extreme age of the site bears on the question of when men entered the western hemisphere
Adovasio, J
An indian hunters' camp for 20,000 years : a rock shelter in western Pennsylvania was periodically occupied from about 19,000 B.C to A.D 1000 The extreme age of the site bears on the question of when men entered the western hemisphere
An indian hunters' camp for 20,000 years : a rock shelter in western Pennsylvania was periodically occupied from about 19,000 B.C to A.D 1000 The extreme age of the site bears on the question of when men entered the western hemisphere