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1.	Use of stable isotopes of carbon, nitrogen, and sulfur to identify sources of nitrogen in surface waters in the Lower Susquehanna River Basin, Pe[...] Cravotta, Charles A., III.; Pennsylvania. Bureau of Soil and Water Conservation.; Ge[...] Lemoyne, Pa. : U.S. Geological Survey ; Denver, Colo. : U.S. Geological Survey, Earth Science Information Center, Open-File Reports Section [distributor], 1995. I 19.76: 94-510 \| Detailed record - Similar records
2.	Use of stable isotopes of carbon, nitrogen, and sulfur to identify sources of nitrogen in surface waters in the lower Susquehanna River Basin, Pe[...] Cravotta, Charles A., III.; Pennsylvania. Bureau of Soil and Water Conservation.; Ge[...] [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver CO : U.S. Geological Survey, Branch of Information Services, 1997 [i.e., 2002]. TD427.N5 C73 1997 \| Map It \| Multiple e-resources available \| Available Online \| Detailed record - Similar records
3.	Water-quality data for two surface coal mines reclaimed with alkaline waste or urban sewage sludge, Clarion County, Pennsylvania, May 1983 throug[...] Dugas, Diana L.; Cravotta, Charles A., III; Saad, David A.; Pennsylvania. Bureau of Mi[...] Lemoyne, Pa. : U.S. Geological Survey ; Denver, Colo. : Books and Open-File Reports Section [distributor], 1993. I 19.76: 93-115 \| Detailed record - Similar records

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