Image: Bighorn Medicine Wheel, Wyoming. Photo by Michael F. Brown, 1998

Website of National Association of Tribal Historic Preservation Officers
Full-text (.pdf) article by Ken Mulvaney, "Management Strategies and the Component of Indigenous Sacred Places," 1999.
Sacred Land Film Project, including information on the documentary In the Light of Reverence: Protecting America's Sacred Lands.
Website of Sacred Sites International
Special issue of Cultural Survival Quarterly, American Indian Religious Freedom, 1996 (includes articles on sacred-sites issues).
"In the absence of title: Responding to federal ownership in sacred sites cases," essay by Kristen A. Carpenter in the New England Law Review, 2003 (pdf).