1998
Holycross, A.T. 1998. Natural History Observations at the El Pinito Ranch, July 1998: Courtesy Report to Landowners Josiah and Valar Austin. Department of Biology, Arizona State University, Tempe, AZ, p.13.
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Crotalus willardi obscurus
Holycross, A.T. 1998. Natural History Observations at the El Pinito Ranch, July 1998: Courtesy Report to Landowners Josiah and Valar Austin. Department of Biology, Arizona State University, Tempe, AZ, p.13.
Holycross, A.T. 1995. Status of the Animas Mountains Population of Crotalus willardi obscurus. Unpublished Report of Activities Conducted Under professional Service Contract No. 95-516-28 for the New Mexico Game and Fish Department (NMDGF). Arizona State
Montoya, B. (1993) Unpublished letter to Dr. John G. Rogers, Regional Director of US Fish and Wildlife Services, Regarding Fish Monitoring. Retrieved from Silver City Ranger District, Gila National Forest, USFS. 8 p.
Montoya, B. 1993.Tables and maps for aquatic species collected during the calendar year1993. New Mexico Department of Game and Fish. Santa Fe, New Mexico. 7 p.
New Mexico Department of Game and Fish. September, 2000. Threatened and endangered species of New Mexico, biennial review and recommendations. Revised Draft. 139 p.
Christman, M.R. 2011. Photograph and sighting of Crotalus willardi obscurus.
Tyrpak, C. 1994. Ridgenose rattlers: Enigma in the Animas. New Mexico Wildlife. 39(2):19.
Barker, D.G. 1990. Variation, infraspecific relationships and biogeography of the Ridgenose Rattlesnake, Crotalus willardi. Biology of the Pitvipers. p. 89-105.
Propst, D. 2007. New Mexico Department of Game and Fish collections under USFWS permit TE815409-0 for 2006. 4 p.
Painter, C. 1999. Status of New Mexico Ridgenose Rattlesnake. Performance report to U.S. Fish and Wildlife Service, Section 6 E-23-7. New Mexico Department of Game and Fish, 10 p.