Western has access to the complete Congressional Serial Set from 1789 to 1969, through ProQuest Congressional, The Congressional Serial Set is an excellent source for primary sources in U.S. History. It contains committee documents and reports from both houses of Congress.
American Indian Documents in the Congressional Serial Set, 1817-1899 (University of Oklahoma Law Library)
Lummi Indian Census rolls. taken by the Bureau of Indian Affairs from 1885-1912, and 1950, are available in the Center for Pacific Northwest Studies on campus.