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January 1, 2012Scientific investigations reportOpen Access

County-level estimates of nitrogen and phosphorus from commercial fertilizer for the Conterminous United States, 1987-2006

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JGJo Ann M. GronbergUnited States Geological Survey NSNorman E. SpahrUnited States Geological Survey

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Gronberg et al. (2012) studied this question.

synapsesocial.com/papers/6a184e6a3ad5dee7381ea810 https://doi.org/10.3133/sir20125207

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1County-level estimates of nutrient inputs to the land surface of the conterminous United States, 1982-20012006 · 191 citations