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1
Surface-water quality changes after 5 years of nutrient management in the Little Conestoga Creek headwaters, Pennsylvania, 1989-91 /
by Koerkle, Edward H.
Lemoyne, Pa. : Denver, Colo. : U.S. Dept. of the Interior, U.S. Geological Survey ; U.S. Geological Survey, Branch of Information Services [distributor], 1997

Government Document Book
2
Preimpoundment hydrologic conditions in the Swatara Creek (1981-84) and estimated postimpoundment water quality in and downstream from the planned Swatara State Park Reservoir, Lebanon and Schuylkill counties, Pennsylvania /
by Fishel, David K.
Harrisburg, Pa. : Denver, Colo. : Dept. of the Interior, U.S. Geological Survey ; U.S. Geological Survey, Books and Open-File Reports Section [distributor], 1988

Government Document Book
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