From the website:
This guide is intended to describe to potential researchers both the archival holdings of the South Dakota State Archives, and other information sources regarding the Lakota, Nakota, and Dakota. It was initially a guide only to the collections of the South Dakota State Archives. However, it became apparent that a guide to primary sources for Indian research in the state should include tribal organizations and federal repositories. Thus the guide includes tribal enrollment offices, BIA realty offices, tribal colleges and universities, other South Dakota resource facilities, and some non-South Dakota facilities.