endangered
Maschinski, J. and H. Louella. 2001. Southwestern rare and endangered plants: Proceedings of the third conference. USDA Forest Service Proceedings RMRS-P-23.. 247 p.
Seglund, A.E., A.E. Ernst, and D.M. O'Neil. 2005. Gunnison's prairie dog conservation assessment. Western Association of Fish and Wildlife Agencies. Laramie, Wyoming. 87 p.
Chapman, A. D. 2005. Uses of Primary Species-Occurrence Data, version 1.0. Report for the Global Biodiversity Information Facility, Copenhagen. 111 p.
Bryan, A.M., R.G. Black, and M.M. Manion. 2000. Draft economic analysis of critical habitat designation for the piping plover: Wintering habitat. Division of Economics; U.S. Fish and Wildlife Service. Arlington, Virginia. 59 p.
USDI Fish and Wildlife Service. 2004. Draft Environmental Assessment for Designation of Critical Habitat for the Mexican Spotted Owl. U.S. Fish and Wildlife Service, Region 2, Albuquerque, New Mexico. 60 p.