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4Geologic map of the Tower City quadrangle, Schuylkill, Dauphin, and Lebanon counties, Pennsylvania /by Wood, Gordon H. (Gordon Harry), 1919-“...U.S. Geological Survey,...”
Published 1968
Government Document Map -
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6by Geyer, Alan R.“...[Commonwealth of Pennsylvania, Bureau of Topographic & Geologic Survey],...”
Published 1970
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7by Willard, Bradford, 1894-“...Department of Internal Affairs, Topographic and Geologic Survey,...”
Published 1939
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8Published 2003“...[U.S. Dept. of the Interior, U.S. Geological Survey],...”
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Government Document Book -
9by Chaplin, Jeffrey J.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2005
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Government Document eBook