Colorado
2002
Brudenburg, W. H. and D. E. Gibson. 2002. San Juan Larval Razorback Sucker Survey. Excerpted from Fiscal year 2002 Project Proposal. 8 p.
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2003
Wunder, M, F. Knopf, and C. Pague. 2003. The high-elevation population of Mountain Plovers in Colorado. The Condor. 105:654-662.
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1996
Weber, W.A., and R.C. Wittmann. 1996a. Colorado flora: Eastern slope. Revised edition. Univ. Press of Colorado, Niwot, Colorado. 524 pp.
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1989
Colorado Native Plant Society. 1989. Rare plants of Colorado. Rocky Mountain Nature Association, Colorado Native Plant Society, Estes Park, Colorado. 73 pp.
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2004
Sivinski, R. 2004. Knowlton's Cactus (Pediocactus knowltonii): Progress Report. New Mexico Forestry Division; Santa Fe, New Mexico. 13 p.
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2002
Sivinski, R. 2002. Population characteristics of mancos milkvetch (Astragalus humillimus: Fabaceae) in San Juan County, New Mexico. New Mexico Forestry Division; Santa Fe, New Mexico. 10 p.
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2002
Heidel, B. and J. Handley. 2002. Draft: Bolophyta alpina (Wyoming feverfew) Conservation Assessment. Wyoming Natural Diversity Database. University of Wyoming. Laramie, Wyoming.
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1996
Weber, W.A., and R.C. Wittmann. 1996b. Colorado flora: Western slope. Univ. Press of Colorado, Niwot, Colorado. 496 pp.
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2002
Tuhy, J, P. Comer, G. Bell, D. Dorfman, B. Neely, M. Lammert, S. Silbert, J. Humke, L. Whitham, B. Cholvin, and B. Baker. 2002. A conservation assessment of the Colorado Plateau Ecoregion. The Nature Conservancy.. 435 p.
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1982
Peterson, S.J. 1982. Threatened and endangered plants of Colorado. U.S. Fish and Wildlife Service, Denver, CO. 35 pp.
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