• 521 Map Library (Robinson)
• 90 Geology and Geophysics Library (Leith)
• 2 Memorial Library
• 1 Verona Shelving Facility
• 1 Wisconsin Historical Society Archives

• 580 Maps, Atlases
• 107 Books
• 20 Journals, Magazines, Newspapers
• 1 Microforms

• 94 Geology
• 31 Groundwater
• 22 Mines and mineral resources
• 15 Coal
• 14 Petroleum
• 13 Natural gas
• 11 Geology, Stratigraphic
• 10 Oil fields
• 9 Coal mines and mining
• 7 Gas fields
• 6 Bituminous coal
• 6 Hydrology
• 6 Sandstone
• 6 Water-supply
• 5 Pennsylvania. Bureau of Topographic and Geologic Survey
• 4 Quality
• 4 Wells
• 3 Anthracite coal
• 3 Borings
• 3 Clay
• 3 Geological surveys
• 3 Geomagnetism
• 3 Land use
• 3 Physical geography
• 3 Shale

• 706 Pennsylvania. Bureau of Topographic and Geologic Survey
• 564 Geological Survey (U.S.)
• 19 Geological Survey (U.S.). Water Resources Division
• 10 Pennsylvania. Department of Conservation and Natural Resources
• 7 Epstein, Jack Burton, 1935-
• 7 Skema, Viktoras W
• 5 Berg, Thomas M
• 5 Sevon, William D
• 5 Taylor, Larry E. (Larry Eugene)
• 4 Ashley, Geo. H. (George Hall), 1866-1951
• 4 Geological Survey of Ohio
• 4 Laughrey, Christopher D
• 4 Lloyd, Orville B
• 4 Lytle, William S
• 4 Newport, Thomas Gwyn, 1922-
• 4 Patterson, E. D. (Elmer Davisson)
• 4 Schiner, George R., 1926-
• 4 Schweinfurth, Stanley P
• 4 Susquehanna River Basin Commission
• 4 West Virginia Geological and Economic Survey
• 3 Barnes, John Henry, 1946-
• 3 Gallaher, John T., 1921-
• 3 Geological Survey of Pennsylvania
• 3 Geyer, Alan R
• 3 Harper, John A

• 706 English

• 658 Pennsylvania
• 12 New Jersey
• 8 Maryland
• 8 New York (State)
• 8 West Virginia
• 6 Ohio
• 5 Monroe County
• 5 Washington County
• 3 Berks County
• 3 Carbon County (Pa.)
• 3 Centre County
• 3 Clarion County
• 3 Elk County (Pa.)
• 3 Lehigh County (Pa.)
• 3 Northampton County
• 3 Susquehanna River Watershed
• 2 Adams County
• 2 Allegheny County
• 2 Bedford County
• 2 Butler County
• 2 Carbon County
• 2 Clearfield County
• 2 Crawford County
• 2 Delaware
• 2 Greene County

• 578 Maps
• 517 Topographic maps
• 4 Bibliography
• 4 Periodicals
• 3 Guidebooks
• 2 Geological maps
• 2 Observations
• 2 Physical maps
• 2 Popular works
• 2 Remote-sensing maps
• 1 Catalogs
• 1 Congresses
• 1 Digital maps
• 1 Directories
• 1 Pictorial works
• 1 Statistics
• 1 Tables
• 1 Thematic maps
• 1 Wall maps

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