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U.S. Dept. of Agriculture. 1986. Soil Survey of Washington County, Colorado.
<br /> U.S. Dept. of Agriculture. 1982. Soil Survey of Weld County, Northern Part, Colorado.
<br /> U.S. Dept. of Agriculture. 1980. Soil Survey of Weld County, Southern Part, Colorado.
<br /> Additional Literature:
<br /> Clark, J., E. Grimm, J. Donovan, S. Fritz, D. Engrstom, and J. Almendinger. 2002. Drought cycles and landscape
<br /> responses to past Aridity on prairies of the Northern Great Plains, USA. Ecology, 83(3), 595-601.
<br /> Collins, S., and S. Barber. (1985). Effects of disturbance on diversity in mixed-grass prairie. Vegetatio, 64, 87-94.
<br /> Colorado Parks &Wildlife. Quick Key to Amphibians and Reptiles of Colorado. 2013. Colorado Parks &Wildlife,
<br /> Denver, CO. cpw.state.co.us
<br /> Egan, Timothy. 2006. The Worst Hard Time. Houghton Mifflin Harcourt Publishing Company: New York, NY.
<br /> Hart, R. and J. Hart. 1997. Rangelands of the Great Plains before European Settlement. Rangelands, 19(1), 4-11.
<br /> Hart, R. 2001. Plant biodiversity on shortgrass steppe after 55 years of zero, light, moderate, or heavy cattle
<br /> grazing. Plant Ecology, 155, 111-118.
<br /> Heitschmidt, Rodney K., J.W. Stuth, (edited by). 1991. Grazing Management, an Ecological Perspective.
<br /> Timberland Press, Portland, OR.
<br /> Jackson, D. 1966. The Journals of Zebulon Montgomery Pike with letters & related documents. Univ. of Oklahoma
<br /> Press, First edition: Norman, OK.
<br /> Mack, Richard N., and J.N. Thompson. 1982. Evolution in Steppe with Few Large, Hooved Mammals. The
<br /> American Naturalist. 119, No. 6, 757-773
<br /> Reyes-Fox, M., Stelzer H., Trlica M.J., McMaster, G.S., Andales, A.A., LeCain, D.R., and Morgan J.A. 2014.
<br /> Elevated CO2 further lengthens growing season under warming conditions. Nature, April 23, 2014 issue at
<br /> http://www.nature.com/nature/journal/v510/n7504/full/naturel3207.html, accessed March, 2017.
<br /> Stahl, David W., E.R. Cook, M.K. Cleaveland, M.D. Therrell, D.M. Meko, H.D. Grissino-Mayer, E. Watson, and B.H.
<br /> Luckman. Tree-ring data document 16th century megadrought over North America. 2000. Eos, 81(12), 121-125.
<br /> The Denver Posse of Westerners. 1999. The Cherokee Trail: Bent's Old Fort to Fort Bridger. The Denver Posse of
<br /> Westerners, Inc. Johnson Printing: Boulder, CO
<br /> U.S. Dept. of Agriculture. 2004. Vascular plant species of the Comanche National Grasslands in southeastern
<br /> Colorado. US Forest Service. Rocky Mountain Research Station. Fort Collins, CO.
<br /> Zelikova, Tamara Jane, D.M. Blumenthal, D.G. Williams, L. Souza, D.R. LeCain, J.Morgan. 2014. Long-term
<br /> Exposure to Elevated CO2 Enhances Plant Community Stability by Suppressing Dominant Plant Species in a
<br /> Mixed-Grass Prairie. Ecology, 2014 issue at www.pnas.org/cgi/doi/l0.1073/pnas.1414659111
<br /> Acknowledgments
<br /> Project Staff:
<br /> Kimberly Diller, Ecological Site Specialist, NRCS MLRA, Pueblo SSO
<br /> Andy Steinert, MLRA 67B Soil Survey Leader, NRCS MLRA Fort Morgan SSO
<br /> Ben Berlinger, Rangeland Management Specialist, Ret. NRCS La Junta, CO
<br /> Program Support:
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