References in nca3 figure 15.2

identifier	ref type	type	title	publication
346e77a5 2011	Report	report	Reactive Nitrogen in the United States: An Analysis of Inputs, Flows, Consequ...	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)
c713eeb5 2003	Journal Article	article	The nitrogen cascade	The Nitrogen Cascade