Bryan Jr., William L. Montana’s Indians. Montana Geographic Series, no. 11. Helena [1]: Montana magazine, 1985. Historical and contemporary sketches.
Eagle/Walking Turtle. Indian America. Santa Fe, N.M.: John Muir Press, 1991. Tribal histories and cultural information for visitors.
Ewers, John C. The Blackfeet: Raiders on the Northwestern Plains. Norman: University of Oklahoma Press, 1958. An anthropological study of the Blackfeet, this is fascinating reading for nonanthropologists too.
Hungry Wolf, Adolf and Beverly, compilers. Indian Tribes of the Northern Rockies. Skookumchuck, B.C.: Good Medicine Books, 1989. Tribal histories from Indian and non-Indian sources.
Lowie, Robert H. Indians of the Plains. Lincoln: University of Nebraska Press, 1954. An anthropological look at all the Plains tribes.
Miller, David Humphreys. Custer’s Fall: The Indian Side of the Story. Lincoln: University of Nebraska Press, 1957. An enthralling retelling of the familiar Custer story based on Indian documentation.
Morgan, R. Kent. Our Hallowed Ground: Guide to Indian War Battlefield Locations in Eastern Montana. Bloomington, Ind.: Authorhouse, 2004. A guide to sites of battles and skirmishes between Native Americans and white forces.
Wilfong, Cheryl. Following the Nez Percé Trail. Corvallis: Oregon State University Press, 1990. An absolutely wonderful, well-thought-out, and moving book that will enhance any trip intersecting with the Nez Percé Trail.
Links:
[1] http://www.moon.com/destinations/montana/butte-helena-and-southwestern-montana/helena