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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

Figure 13
Figure 13. Distribution and classification of cropland areas of the Lower Susquehanna River Basin based on Major Land Uses of the United States (U.S. Geological Survey, 1970) and the row-crop classification system.

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