threats
Knowles, C. 2002. Status of the white-tailed and Gunnison's prairie dogs. National Wildlife Federation, Missoula, MT and Environmental Defense Washington, DC.. 30 p.
Pruett, C., M. Patten, and D. Wolfe. 2009. It's not easy being green: wind energy and a declining grassland bird. Bioscience Volume 59(3):257-262 pp.
Rosmarino, N, N. Alley, M. Schoustra, K. Stade, and J.P. Oliva. 2002. Petition to the U.S. Fish and Wildlife Service to revise the Critical Habitat Designation for the Northern Aplomado Falcon. Forest Guardians, Santa Fe, NM.. 82 p.
Lee-Chadde, S. and L.F. Huenneke. 1997. A handbook of rare, threatened and endangered plant species of the Sacramento Mountains. Dept. of Biology, New Mexico State University, Las Cruces, NM 88003. Draft. pp. 109.
U.S. Fish and Wildlife Service (USFWS). 1981. Determination of two New Mexico plants to be endangered species and threatened species, with critical habitat. Federal Register 46(12): 5730-5733.
Christman, B. 2002. Investigations of the status and distribution of amphibians on the Ladder Ranch. . 18 p.
Fletcher, R. 1985. Kuenzler hedgehog cactus (Echinocereus fendleri var. kuenzleri) recovery plan. U.S. Fish and Wildlife Service, Albuqerque, NM. 44 pp.
Tonne, P. 2002. Status Report for Arizona Willow (Salix arizonica; Salicaceae). Natural Heritage New Mexico, Museum of Southwestern Biology, University of New Mexico.. 49 p.
Lang, B. K. 2001. Status of the Texas hornshell and native freshwater mussels (Unionoidae) in the Rio Grande and Pecos River of New Mexico and Texas. Conservation Services Division, New Mexico Department of Game and Fish.Completion Report. .
U.S. Fish and Wildlife Service (USFWS). 1985. Final rule to determine Astragalus humillimus to be endangered. Federal Register 50(124): 26568-26572.