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Inorganic nitrogen deposition map of the USA from NADP

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This map of inorganic nitrogen wet deposition from nitrate and ammonium is from page 11 of the 2021 NADP Annual Summary.

Reference: National Atmospheric Deposition Program, 2021. National Atmospheric Deposition Program 2021 Annual Summary. Wisconsin State Laboratory of Hygiene, University of Wisconsin-Madison, WI.

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