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. 2020 Aug 10;150(2):139–180. doi: 10.1007/s10533-020-00691-6

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Fig. 15 — Human wastewater inputs of a nitrogen, b phosphorus, and c N:P ratio by weight for different regions of the country. Data are for 2002, 2007 and 2012 and were derived from Sabo et al. (2019) for N and from US EPA (https://doi.org/10.23719/1504278) for P. The upper inset map shows the US regions