Water resources data. Pennsylvania [[electronic resource] / U.S. Department of the Interior, U.S. Geological Survey

MLA

Water Resources Data. Pennsylvania [[electronic Resource] / U.s. Department of the Interior, U.s. Geological Survey. U.S. Dept. of the Interior, U.S. Geological Survey, Water Resources Division, .

APA

Water resources data. Pennsylvania [[electronic resource] / U.S. Department of the Interior, U.S. Geological Survey. U.S. Dept. of the Interior, U.S. Geological Survey, Water Resources Division.

Chicago

Water Resources Data. Pennsylvania [[electronic Resource] / U.S. Department of the Interior, U.S. Geological Survey. : U.S. Dept. of the Interior, U.S. Geological Survey, Water Resources Division.