Classification and Mapping of Agricultural Land for National Water-Quality Assessment

By Robert J. Gilliom and Gail P. Thelin

U.S. Geological Survey Circular 1131

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REFERENCES CITED

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

Baker, O.E., 1921, A graphic summary of American agriculture based largely on the census of 1920: U.S. Department of Agriculture, 1921 Yearbook, p. 407-506.

Elliott, F.F., 1933, Types of farming in the United States: U.S. Department of Commerce, Fifteenth census of the United States, Census of Agriculture, 225 p.

Hirsch, R.M., Alley, W.M., and Wilber, W.G., 1988, Concepts for a National Water-Quality Assessment Program: U.S. Geological Survey Circular 1021, 42 p.

Leahy, P.P., Rosenshein, J.S., and Knopman, D.S., 1990, Implementa- tion plan for the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 90-174, 10 p.

Smith, Middleton, Baker, O.E., and Hainsworth, R.G., 1916, A graphic summary of American agriculture: U.S. Department of Agriculture, 1915 Yearbook, p. 329-403.

Smith, M.G., and Hines, Fred, 1988, Regional characteristics of U.S. farms and farmers in the 1980's: U.S. Department of Agriculture, Economic Research Service, Agriculture and Rural Economy Division, 28 p.

Sommer, J.E., and Hines, F.K., 1991, Diversity in U.S. agriculture-A new delineation by farming characteristics: U.S. Department of Agriculture, Economic Research Service, Agricultural Economic Report Number 646, 19 p.

Spillman, W.J., 1908, Types of farming in the United States: U.S. Department of Agriculture, Yearbook, p.351-366.

U.S. Department of Commerce, 1995, 1992 Census of Agriculture: Washington, D.C.[CD-ROM, dBase format].

U.S. Department of Agriculture, 1950, Generalized types of farming in the United States, including a list of counties in type-of-farming regions and subregions: U.S. Department of Agriculture, Bureau of Agricultural Economics, Agriculture Information Bulletin No. 3, 35 p.

U.S. Geological Survey, 1970, The national atlas of the United States of America: Washington, D.C., United States Department of the Interior, U.S. Geological Survey, p. 158-159.

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