"epa-sab-11-013" . "Reactive Nitrogen in the United States: An Analysis of Inputs, Flows, Consequence, and Management Options. A Report of the EPA Science Advisory Board. (EPA-SAB-11-013)"^^ . "2011"^^ . "http://yosemite.epa.gov/sab/sabproduct.nsf/WebBOARD/INCSupplemental?OpenDocument"^^ . "report" . . . . . . . . . . . _:genid1 . _:genid1 . _:genid1 . _:genid1 .