A checklist of the aquatic invertebrates of the Delaware River basin, 1990-2000

by Bilger, Michael D.
Published: U.S. Geological Survey, 2005

Occurrence of organochlorine compounds in whole fish tissue from streams of the lower Susquehanna River Basin, Pennsylvania and Maryland, 1992

by Bilger, Michael D.
Published: U.S. Dept. of the Interior, U.S. Geological Survey ; Branch of Information Services [distributor], 1999

Fish communities and their relation to physical and chemical characteristics of streams from selected environmental settings in the Lower Susquehanna River Basin, 1993-95

Corr. print..

by Bilger, Michael D.
Published: U.S. Dept. of the Interior, U.S. Geological Survey ; U.S. Geological Survey, Branch of Information Services [distributor], 1998

Fish communities and their relation to physical and chemical characteristics of streams from selected environmental settings in the Lower Susquehanna River Basin, 1993-95

by Bilger, Michael D.,
Published: U.S. Department of the Interior, U.S. Geological Survey, 1998

Relation of algal biomass to characteristics of selected streams in the Lower Susquehanna River Basin

by Brightbill, Robin A.
Published: U.S. Dept. of the Interior, U.S. Geological Survey ; Branch of Information Services [distributor], 1998

Trends in concentrations of polychlorinated biphenyls in fish tissue from selected sites in the Delaware River basin in New Jersey, New York, and Pennsylvania, 1969-98

by Riva-Murray, Karen.
Published: U.S. Dept. of the Interior, U.S. Geological Survey, 2003

Trends in concentrations of polychlorinated biphenyls in fish tissue from selected sites in the Delaware River basin in New Jersey, New York, and Pennsylvania, 1969-98

by Riva-Murray, Karen.
Published: [U.S. Dept. of the Interior, U.S. Geological Survey]: [[Branch of Information Services, distributor], 2003

Fish-community composition in Cowanesque River upstream and downstream of the Cowanesque Dam, Tioga County, Pennsylvania, 1998

by Brightbill, Robin A.,
Published: U.S. Department of the Interior, U.S. Geological Survey, 1999

Fish-community composition in Mill Creek, Crooked Creek, and Tioga River in the vicinity of Tioga-Hammond Dams, Tioga County, Pennsylvania, 1998

by Brightbill, Robin A.,
Published: U.S. Department of the Interior, U.S. Geological Survey, 1999

Fish-community composition in Cowanesque River upstream and downstream of the Cowanesque Dam, Tioga County, Pennsylvania, 1998

by Brightbill, Robin A.
Published: U.S. Dept. of the Interior, U.S. Geological Survey ; Branch of Information Services [distributor], 1999

Fish-community composition in Mill Creek, Crooked Creek, and Tioga River in the vicinity of Tioga-Hammond Dams, Tioga County, Pennsylvania, 1998

by Brightbill, Robin A.
Published: U.S. Dept. of the Interior, U.S. Geological Survey ; Branch of Information Services [distributor], 1999

Surface-water quality changes after 5 years of nutrient management in the Little Conestoga Creek headwaters, Pennsylvania, 1989-91

by Koerkle, Edward H.
Published: U.S. Dept. of the Interior, U.S. Geological Survey ; Branch of Information Services [distributor], 1997

Surface-water quality changes after 5 years of nutrient management in the Little Conestoga Creek headwaters, Pennsylvania, 1989-91

by Koerkle, Edward H.,
Published: U.S. Geological Survey, 1997