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Spatial Data in Geographic Information System Format on Agricultural Chemical Use, Land Use, Cropping Practices in United States
Gratis
Occurrence and Transport of Agricultural Chemicals in the Mississippi River Basin, July Through August 1993: Issue 1120, Part 3
Gratis
Distribution of Selected Herbicides and Nitrate in the Mississippi River and Its Major Tributaries, April Through June 1991: Issues 91-4163
Gratis
Occurrence and Transport of Agricultural Chemicals in the Mississippi River Basin, July Through August 1993: Issue 1120
Gratis