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Books from the extended shelves:
Vogel, Karen L.: Geohydrology and simulation of ground-water flow in the Red Clay Creek Basin, Chester County, Pennsylvania, and New Castle County, Delaware (U.S. Dept. of the Interior, U.S. Geological Survey ;, 1993), also by Andrew G. Reif, Delaware Geological Survey, Chester County Water Resources Authority, and Geological Survey (U.S.) (page images at HathiTrust)
Vogel, Karen L.: Radium and radon in ground water in the Chickies Quartzite, southeastern Pennsylvania (U.S. Dept. of the Interior, U.S. Geological Survey ;, 1995), also by Lisa A. Senior, Geological Survey (U.S.), Pennsylvania. Bureau of Radiation Protection, and Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust)See also what's at your library, or elsewhere.
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