United States Census Indian Schedules
(Not to be confused with Indian census rolls.) There are two kinds of Indian census schedules. This page is about the the kind of special schedules made at the same time as regular federal population schedules. If during his visit to the rest of the population, a census taker discovered a resident was an American Indian, the census taker completed a separate, additional schedule for that person. For the 1910 federal census, Indian schedules are found at the end of the regular population schedules for each county. The Indian schedules are similar but have some slightly different questions from the regular population schedules.
Another kind of Indian census was often taken one tribe (Indian nation) at a time, and relatively few non-Indians were counted. Tribal censuses, or Indian census rolls counted mostly Indians living in that tribe. They were taken at the a different time than the regular United States federal censuses. This type of Indian or tribal census, or Indian census roll is not described any further on this Wiki page. For further information about this kind of Indian or tribal census see American Indian Census Rolls.
Indian Census Rolls, 1885-1940
including some Vital Records
National Archives: http://www.archives.gov/genealogy/census/native-americans/
Access Genealogy: http://www.accessgenealogy.com/native/census/index.htm
Szucs, Loretto Dennis and Wright, Matthew. Finding Answers in U.S. Census Records. (Orem, Utah: 2001 Ancestry) FHL Book 973 X27s.