orthophotography
White Sands National Monument. 2003. Natural color orthophotography over White Sands National Monument, Set of 8 DVDs.
EarthData International. 2003. Aerial photography, topographic mapping and digital orthophotography for the National Guard Bureau. EarthData International of Maryland LLC, 7320 Executive Way, Frederick, Maryland.
Earth Data Analysis Center. 1999. Color orthophotography over Chaco.
Horizon Inc. 2003. Color aerial orthophotography over El Malpais National Monument.
Pacific Western Technologies, Ltd. 2004. Color aerial photography for the Valle Vidal Minerals Project Area, Carson National Forest, Questa Ranger District in New Mexico. Pacific Western Technologies, Ltd., 7007 Wyoming Blvd NE Bldg. C, Albuquerque, NM.
Johnson, K., T. Neville, D. Mikesic, and D. Talayumptewa. 2010. Distributional analysis of Gunnison's Prairie Dog (Cynomys gunnisoni) on the Navajo Nation and Reservation of the Hopi Tribe. Natural Heritage New Mexico Publ. No. 10-GTR-357. Natural Heritag
Johnson, K., T. Neville, and A. Kirk. 2006. Remote sensing re-survey of black-tailed prairie dog towns in Southeastern New Mexico. Natural Heritage New Mexico Publication No. 06-GTR-296. University of New Mexico, Albuquerque, NM, 22p.