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Andersen, J.R., E.E. Hardy, J.T. Roach, and R.E. Witmer. 1976. A land use and 
     land cover classification system for use with remote sensor data. U.S. 
     Geological Survey Paper 964, 28 p.

Brandle, J.R., T.D. Wardle, and G.F. Bratton. 1992. Opportunities to increase 
     tree planting in shelterbelts and the potential impacts on carbon storage 
     and conservation. In Sampson, R.N. and D. Hair (eds.), Forests and Global 
     Change Volume One: Opportunities for Increasing Forest Cover, pp 157-176. 
     American Forests, Washington, D.C.

Bratton, G.F., P. R. Schaefer, and J. R. Brandle. 1993. Conservation forestry 
     for sustainable Great Plains ecosystems. In Conservation of Great Plains 
     Ecosystems: Current Science,Future Options. Kansas City, MO, April 7-9, 1993.

Buol, S.W., P.A. Souchez, S.B. Weed, and J.M. Kimble. 1990. Predicted impact of 
     climatic warming on soil properties and use. In Impact of Carbon Dioxide, 
     Trace Gases, and Climate Change on Global Agriculture, ASA Special Publication
     No. 53, American Soc. of Agronomy, Madison, WI.

Cole. C V.. J.W.B. Stewart, D.S. Ojima. W.J. Parton, and D.S. Schimel. 1989. 
     Modelling land use effects of soil organic matter dynamics in the North 
     American Plains. In Ecology of Arable Land. M. Clarholm and L. Bergstrom 
     (eds.), pp. 8998. Kluwer Academic Publications.

Conservation Technology Information Center (CTIC). 1995. 1995 National crop 
     residue management survey. West Lafayette, IN.

Council for Agricultural Science and Technology (CAST). 1992. Preparing U.S. 
     agriculture for global climate change. Task Force Report No. 119, Ames, IA.

Elliot, E.T., H.H. Franzen, C.A. Campbell, C.V. Cole, and R.J.K. Myers. Principles
     of ecosystem analysis and their application to integrated nutrient management 
     and assessment of sustainability. In Sustainable land management for the 21st 
     Century. Vol.2: Plenary Papers, Proceedings of the International Workshop on 
     Sustainable Land Management for the 21st Century, pp.35-57, Lethbridge, Canada, 
     June 20-26, 1993.

Elliott, E.T., K. Paustian, and C.V. Cole. 1994. Regional projections of C dynamics 
     with global change in the central United States: interactive effects of 
     management, climate, and elevated CO2. Annual Report, National Inst. for 
     Global Environmental Change, Univ. of California, Davis, CA.

Garrett, H.E., L.E. Buck, M.A. Gold, L.H. Hardesty, W.B. Kurtz, J.P. Lassoie, 
     H.A. Pearson, and J.P. Slusher. 1994. Agroforestry: An integrated land-use 
     management system for production and farmland conservation. A Comprehensive
     Assessment of U.S. Agroforestry prepared for the USDA SCS. 58 p.

Gebhart, D.L., H.B. Johnson, H.S. Mayeux, and H.W. Polley. 1994. The CRP increases
     soil organic soil. Journal of Soil and Water Conservation 49(5):488-492.

Kellogg, R.L., M.S. Maizel, and D.W. Goss. 1992. Agricultural chemical use and 
     ground water quality: where are the potential problem areas? USDA Soil 
     Conservation Service, Economic Research Service, Cooperative States Research 
     Service, and the National Center for Resource Innovations. Washington. D.C.

Korte P.A.. and L.H. Fredickson. 1977. Loss of Missouri's lowland hardwood 
     ecosystem. Trans. of the 42nd North American Wildlife and Natural Resources 
     Conference, Wildlife Management Institute, Washington, D.C.

Lindstrom, M.J., T.E. Schumacher, and M.L. Blecha. 1994. Management considerations 
     for returning CRP lands to crop production. Journal of Soil and Water Conservation
     49(5):420-425.

Loveland, T.R., J.W. Merchant, D.O. Ohlen, and J.F. Brown. 1991. Development of 
     a land and cover characteristics database for the conterminous U.S.  
     Photogrammetric Engineering and Remote Sensing, Vol. 57(11):1453-1463.

Lyon, D.J., and J.W. Doran. 1995. Effects of long-term tillage in a winter wheat-
     fallow system on soil quality. Abstracts of the Converting CRP-Land to 
     Cropland and Grazing Conservation Technologies for the Transition Conference. 
     Soil and Water Conservation Society, Lincoln, NE.

Majumdar, S.K., L.S. Kalkstein, E.W. Miller, and L.M. Rosenfield. 1992. Global 
     climate change: implications, challenges, and mitigation measures. The 
     Pennsylvania Academy of Science, Easton, PA 18402.

Osborne, L. L., and M.J. Wiley. 1988. Empirical relationships between land 
     use/cover and stream water quality in an agricultural watershed. J. Envir. 
     Management 26:9-27.

Peterson, G.A., and C.V. Cole. Productivity of Great Plains soils: past, present, 
     and future. Natural Resource Ecology Laboratory, Colorado State University, 
     Ft. Collins, Colorado.

Powell, D.S., J.L. Faulkner, D.R. Darr, Z. Zhu, and D.W. MacCleery. 1993. Forest 
     resources of the United States, 1992. USDA Forest Service Gen. Tech. Rep. 
     RM-234. 132p.

Potash and Phosphate Institute. 1990. Soil test summaries: phosphorus, potassium, 
     and pH. Better Crops with Plant Food 74(2):16-18.

Rosek, M.J., J.C. Gardner, D.L. Allen, M. Alms, D.F. Bezdicek, D.R. Huggins, D.L. 
     Karlen, B.S. Miller, and M.L. Staben. 1995. Soil quality changes in response 
     to the Conservation Reserve Program. Abstracts of the Converting CRP-Land to 
     Cropland and Grazing Conservation Technologies for the Transition Conference. 
     Soil and Water Conservation Society, Lincoln, NE.

Schertz, D.L. 1995. Post-CRP land use information needed by action agencies. 
     Abstracts of the Converting CRP-Land to Cropland and Grazing Conservation 
     Technologies for the Transition Conference. Soil and Water Conservation Society, 
     Lincoln, NE.

Seevers, K. 1994. Morphological and chemical changes in Moody and Hastings soils 
     after 30 to 35 years of cultivation. Masters Thesis, Dept. of Agronomy, 
     University of Nebraska, Lincoln, NE.

Shaefer, P.R., and J.J.Ball. 1995. Present status and future potential for 
     agroforestry in the Northern Great Plains. Proceedings, Agroforestry and 
     Sustainable Systems Symposium, 1994, August 7-10, Fort Collins, CO. USDA 
     Forest Service General Tech. Rep. RM-GTR-261 pages 115-125.

Sinclair, H.R. 1995. SRPG calculation summary. National Soil Survey Center, 
     Lincoln, NE. p. 24.

Sinclair, H.R., and H. Terpstra. 1995. Soil ratings for plant growth. Iowa 
     State University Statistical Laboratory. Ames, Iowa.

Soil Survey Staff. 1981. Land Resource Regions and Major Land Resource Areas of 
     the U.S. USDA Handbook 296 and map (revised 1984).

Soil Survey Staff. 1994a. Colorado State Soil Geographic Data Base (CO-STATSGO). 
     USDA-Natural Resources Conservation Service. Lakewood, CO. Digital Soil Map 
     and Attribute Data Base on CD-ROM.

Soil Survey Staff. 1994b. Kansas State Soil Geographic Data Base (KS-STATSGO). 
     USDA-Natural Resources Conservation Service. Salina, KS. Digital Soil Map 
     and Attribute Data Base on CD-ROM.

Soil Survey Staff. 1994c. Montana State Soil Geographic Data Base (MT-STATSGO). 
     USDA-Natural Resources Conservation Service. Bozeman, MT. Digital Soil Map 
     and Attribute Data Base on CD-ROM.

Soil Survey Staff. 1994d. Nebraska State Soil Geographic Data Base (NE-STATSGO). 
     USDA-Natural Resources Conservation Service. Lincoln, NE. Digital Soil Map 
     and Attribute Data Base on CD-ROM.

Soil Survey Staff. 1994e. North Dakota State Soil Geographic Data Base (ND-STATSGO).
     USDA-Natural Resources Conservation Service. Bismarck, ND. Digital Soil Map 
     and Attribute Data Base on CD-ROM.

Soil Survey Staff. 1994f South Dakota State Soil Geographic Data Base (SD-STATSGO). 
     USDA-Natural Resources Conservation Service. Huron, SD. Digital Soil Map and 
     Attribute Data Base on CD-ROM.

Soil Survey Staff. 1994g. Wyoming State Soil Geographic Data Base (WY-STATSGO). 
     USDA-Natural Resources Conservation Service. Casper, WY. Digital Soil Map 
     and Attribute Data Base on CD-ROM.

Soil Survey Staff. 1995. Soil survey laboratory information manual. Soil Survey 
     Investigations Report No. 45. USDA Natural Resources Conservation Service, 
     National Soil Survey Center, Soil Survey Laboratory, Lincoln, NE.

Sommer, J.E., and F.K. Hines. 1991. Diversity in U.S. Agriculture: A new delineation 
     by farming characteristics. Report No. 646, Agriculture and Rural Economy 
     Division, Economic Research Service, U.S. Department of Agriculture.

Spalding, R.F., and M.E. Exner. 1991. Nitrate contamination in the contiguous 
     United States. In Series G: Ecological Sciences, I. Bogundi and R.D. Kuzelka 
     (eds.), NATO ASI Series, Vol. G30.

Srinivasan, R., J.G. Arnold, R.S. Muttiah, and P.T. Dyke. 1995. Plant and 
     hydrologic simulation for the conterminous U.S. using SWAT and GIS. In press.
     Blackland Research Center, Texas A and M University System, Temple, TX.

Srinivasan, R. 1995. Digital datasets from the HUMUS Project. Blackland Research 
     Center, Texas A and M University System, Temple, TX.

USDA National Agricultural Statistics Service (NASS). 1995a. Hogs and pigs: 
     final estimates for 1988-1992. Agricultural Statistics Board Statistical 
     Bulletin No. 904. Washington, DC

USDA National Agricultural Statistics Service (NASS). 1995b. Cattle on feed: final 
     estimates for 1988-1992. Agricultural Statistics Board Statistical Bulletin 
     No. 905. Washington, DC.

USDA National Agricultural Statistics Service (NASS). 1995c. Sheep and goats: 
     final estimates for inventory of 1989-1993. Agricultural Statistics Board 
     Statistical Bulletin No. 906, Washington, DC.

U. S. Bureau of the Census. 1994. USA Counties 1994, a Statistlcal Abstract 
     Supplement on CD-ROM. U.S. Department of Commerce. Economics and Statistics 
     Administration.

U.S. Bureau of the Census. 1992. 1992 Census of Agricuolture on CD-ROM. U.S. 
     Department of Commerce, Economics and Statistics Administration.

U.S. Bureau of the Census. 1990. Selected social and population characteristics. 
     Department of Commerce, Washington, D.C.

USDA Soil Conservation Service. 1981. Land resource regions and major land 
     resource areas of the United States. Agric. Handbook 296. U.S. Gov't 
     Printing Office, Washington, DC.

U.S. Congress, Office of Technology Assessment. 1993. Preparing for an uncertain 
     climate. Vol. I & II.

U.S. Department of Commerce. 1987. Census of Agriculture. U.S. Gov't Printing 
     Office, Washington, D.C.

U.S. Department of Commerce. 1989. Census of Agriculture. U.S. Gov't Printing 
     Office, Washington, D.C.

U.S. Department of Commerce. 1993. Census of Agriculture. U.S. Gov't Printing 
     Office, Washington, D.C.

USDA Natural Resources Conservation Service. 1987. National Resources Inventory 
     (NRI). Unpublished data tables on Windbreaks.

USDA Natural Resources Conservation Service. 1994. Summary Report 1992 National 
     Resources Inventory. Iowa State University Statistical Laboratory, Ames, IA.

USDI Bureau of Indian Affairs. 1993. Indian service population and labor force 
     estimates. Washington, D.C.

USDI Bureau of Indian Affairs. 1995. U.S. Reservation boundaries. Arc Export 
     Format. Geographic Data Service Center, Lakewood, CO.

U.S. Environmental Protection Agency. 1990. National survey of pesticides in 
     drinking water wells, Phase I report. Washington, D.C.

U.S. Geological Survey. 1986. Land use and land cover digital data from 1:250,000- 
     and 1:1,100,000-scale maps. USGS Data User's Guide No. 4, Reston, VA.

Waltman, S.W. 1995. Queries from the Pre-release National Map Unit Interpretation 
     Record (MUIR). National collection of digital detailed soil survey attribute 
     data sets on CDROM. Lincoln, NE.