Spatial data in geographic information system format on agricultural chemical use, land use, cropping practices in United States / by William A. Battaglin and Donald A. Goolsby ; prepared in cooperation with the U.S. Environmental Protection Agency
Also available via Internet at the USGS web site. Address as of 09/17/03: http://water.usgs.gov/pubs/wri/wri944176/; current access available via PURL.
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