Regional estimates of the amount of U.S. agricultural land located in watersheds with poor water quality (Q83233)

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Regional estimates of the amount of U.S. agricultural land located in watersheds with poor water quality; 1994; OFR; 94-399; Smith, Richard A.; Schwarz, Gregory E.; Alexander, Richard B.
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Regional estimates of the amount of U.S. agricultural land located in watersheds with poor water quality
Regional estimates of the amount of U.S. agricultural land located in watersheds with poor water quality; 1994; OFR; 94-399; Smith, Richard A.; Schwarz, Gregory E.; Alexander, Richard B.

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