National Water-Quality Assessment Program (U.S.), Geological Survey (U.S.), & Stark, J. R. (2000). Water quality in the Upper Mississippi River Basin, Minnesota, Wisconsin, South Dakota, Iowa, and North Dakota, 1995-98. U.S. Geological Survey, Water Resources Division Free on application to the U.S. Geological Survey, Information Services.
Chicago-Zitierstil (17. Ausg.)National Water-Quality Assessment Program (U.S.), Geological Survey (U.S.), und James R. Stark. Water Quality in the Upper Mississippi River Basin, Minnesota, Wisconsin, South Dakota, Iowa, and North Dakota, 1995-98. Reston, Va., Denver, CO: U.S. Geological Survey, Water Resources Division Free on application to the U.S. Geological Survey, Information Services, 2000.
MLA-Zitierstil (9. Ausg.)National Water-Quality Assessment Program (U.S.), et al. Water Quality in the Upper Mississippi River Basin, Minnesota, Wisconsin, South Dakota, Iowa, and North Dakota, 1995-98. U.S. Geological Survey, Water Resources Division Free on application to the U.S. Geological Survey, Information Services, 2000.