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A direct approach for estimating nitrogen, phosphorus, and land demands at the regional level
United States. Dept. of Agriculture. Economic Research Service.
Fertilizers -- Prices -- United States -- Mathematical models.
Fertilizers -- Government policy -- United States.
vi, 17 p.
U.S. Dept. of Agriculture, Economic Research Service
This item is authored by federal employees as part of their official duties and are therefore non-copyrightable and/or published by the federal government and now in the public domain.
Agricultural Research Service
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