Nitrogen deposition to lakes in national parks of the western Great Lakes region: Isotopic signatures, watershed retention, and algal shifts, William O. Hobbs, Brenda Moraska Lafrancois, Robert Stottlemyer, David Toczydlowski, Daniel R. Engstrom, Mark B. Edlund, James E. Almendinger, Kristin E. Strock, David Vandermeulen, Joan E. Elias, Jasmine E. Saros
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