Boas Franz. Handbook of American Indian languages. Volume 1

Washington: Government Printing Office, 1911. — 158 p.The Handbook American Indian languages had its inception in an attempt to prepare a revised edition of the "Introduction to the Study of Indian Languages," by Major J. W. Powell."The Athapascan stock is one of the largest and most widely distributed families of speech in North America. Geographically it consists of three divisions, the northern, the Pacific coast, and the southern. The northern division 1 occupies much of the northwestern portion of the continent. East of the Rocky mountains the southern boundary is the Churchill river at the southeast, and the watershed between Athabasca and Peace rivers at the southwest."