Vidon, Philippe, Hilary Hubbard, Pilar Cuadra, and Matthew Hennessy. “Storm NO<sub;>3< sub><sup>-< sup> and NH<sub;>4< sub><sup>+< Sup> Exports in Stream, Overland Flow, and Tile Drains of the US Midwest”. Annals of Environmental Science 6 (September 19, 2012). Accessed July 14, 2024. https://openjournals.neu.edu/aes/journal/article/view/v6art5.