Water quality in the Potomac River basin, Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia, 1992-96 /

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245 0 0 ‡aWater quality in the Potomac River basin, Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia, 1992-96 / ‡cby Scott W. Ator ... [et al.].
260 ‡aReston, Va. : ‡bU.S. Geological Survey, Water Resources Division ; ‡aDenver, CO : ‡bFree on application to the U.S. Geological Survey, Information Services, ‡c[2000], c1998.
300 ‡a38 p. : ‡bcol. ill., col. maps ; ‡c28 cm.
490 0 ‡aU.S. Geological Survey circular ; ‡v1166
538 ‡aMode of access: Internet.
610 2 0 ‡aNational Water-Quality Assessment Program (U.S.)
650 0 ‡aWater quality ‡zPotomac River Watershed.
700 1 ‡aAtor, Scott W.
710 2 ‡aGeological Survey (U.S.)
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