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1
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2Published 1972“...Bureau of Topographic and Geologic Survey],...”
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3by Hollowell, Jerrald R.“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1971
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4by Meisler, Harold“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1971
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5by Newport, Thomas Gwyn, 1922-“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1973
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6by Newport, Thomas Gwyn, 1922-“...[Topographic and Geologic Survey; may be purchased from Bureau of Publications],...”
Published 1971
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7by Johnston, Herbert E.“...[Commonwealth of Pennsylvania, State Planning Board, Bureau of Topographic and Geologic Survey],...”
Published 1970
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8by Poth, Charles W.“...[Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey],...”
Published 1968
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9by Newport, Thomas Gwyn, 1922-“...Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1973
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10by Poth, Charles W.“...Commonwealth of Pennsylvania Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1973
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11by Poth, Charles W.“...Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1973
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12by Lloyd, Orville B.“...Commonwealth of Pennsylvania, Department of Environmental Resources, Bureau of Topographic...”
Published 1977
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13by Becher, Albert E.“..., Bureau of Topographic and Geologic Survey],...”
Published 1991
Internet Archive, State Library of Pennsylvania
Government Document Book