Coulson, R.N., C.N. Lovelady, R.O. Flamm, S.L. Spradling, and M.C. Saunders. 1991. Intelligent geographic information systems for natural resource management. pp 153-172. In: Quantitative methods in landscape ecology. Turner, M.G. and R.H. Gardner, eds. Springer-Verlag, New York.
North American Landscape Characterization (NALC) http://edcwww.cr.usgs.gov/glis/hyper/guide/nalc
Sample, V.A. 1994. Realizing the potential of remote sensing and GIS in ecosystem management planning, analysis, and policymaking. pp 346-352. In: Remote sensing and GIS in ecosystem management. Sample, V.A., ed. Island Press, Washington, D.C..
USDA 1976a. Land use and natural communities: Gunnison County, Colorado. United States Department of Agriculture, Soil Conservation Service, Portland, Oregon.
USDA 1976b. Land use and natural communities: Hinsdale County, Colorado. United States Department of Agriculture, Soil Conservation Service, Portland, Oregon.
USDA 1976c. Land use and natural communities: Saguache County, Colorado. United States Department of Agriculture, Soil Conservation Service, Portland, Oregon.
USDA 1995. Guidelines for the Use of Digital Imagery for Vegetation Mapping. United States Department of Agriculture, Forest Service Engineering Staff. Washington D.C..
USGS 1996a. 1-Degree USGS Digital Elevation Models. United States Geological Survey. Http://edcwww.cr.usgs.gov/glis/hyper/guide/1_dgr_dem.
USGS 1996b. Thematic Mapper Landsat Data. United States Geological Survey. Http://edcwww.cr.usgs.gov/glis/hyper/guide/landsat_tm.