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Books by Chester County (Pa.). Health Department:

Books in the extended shelves:

• Chester County (Pa.). Health Department: Geohydrology and ground-water quality, Big Elk Creek Basin, Chester County, Pennsylvania, and Cecil County, Maryland (U.S. Dept. of the Interior, U.S. Geological Survey ;, 2002), also by Ronald A. Sloto, Geological Survey (U.S.), and Chester County Water Resources Authority (page images at HathiTrust)
• Chester County (Pa.). Health Department: Ground water resources of Big Elk Creek basin, Pennsylvania and Maryland ([U.S. Dept. of the Interior, U.S. Geological Survey], 2002), also by Ronald A Sloto, Geological Survey (U.S.), and Chester County Water Resources Authority (page images at HathiTrust)
• Chester County (Pa.). Health Department: Historical trends and concentrations of fecal coliform bacteria in the Brandywine Creek basin, Chester County, Pennsylvania (U.S. Dept. of the Interior, U.S. Geological Survey ;, 2001), also by Debra A. Town, Geological Survey (U.S.), and Chester County Water Resources Authority (page images at HathiTrust)
• Chester County (Pa.). Health Department: Radon-222 in the ground water of Chester County, Pennsylvania (U.S. Dept. of the Interior, U.S. Geological Survey ;, 1998), also by Lisa A. Senior and Chester County Water Resources Authority (page images at HathiTrust)
• Chester County (Pa.). Health Department: Radon in the ground water of Chester County, Pennsylvania (U.S. Dept. of the Interior, U.S. Geological Survey, 1998), also by Ronald A Sloto, Geological Survey (U.S.), and Chester County Water Resources Authority (page images at HathiTrust)

Find more by Chester County (Pa.). Health Department at your library, or elsewhere.