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Water quality in the Potomac River basin, Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia, 1992-96 /
by Scott W. Ator ... [et al.].

APA Citation

Ator, S. W., Geological Survey (U.S.). (20001998). Water quality in the Potomac River basin, Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia, 1992-96. Reston, Va.: U.S. Geological Survey, Water Resources Division .

MLA Citation

Ator, Scott W, and Geological Survey (U.S.). Water Quality In the Potomac River Basin, Maryland, Pennsylvania, Virginia, West Virginia, And the District of Columbia, 1992-96. Reston, Va.: U.S. Geological Survey, Water Resources Division , 20001998.

Warning: These citations may not always be complete (especially for serials).