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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 12
Figure 12. Distribution and classification of cropland areas of the United States based on Major Land Uses of the United States (U.S. Geological Survey, 1970) and the row-crop classification system.
Figure 12 Explanation
Figure 12. Continued

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