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41by Conger, Randall W.“...U.S. Geological Survey,...”
Published 1997
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42by Wood, Charles R.“...U.S. Geological Survey,...”
Published 1996
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43
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44by Markowski, Antonette K., 1956-“...Bureau of Topographic and Geologic Survey,...”
Published 2001
Government Document Book -
45“...Pennsylvania, Bureau of Topographic and Geologic Survey,...”
Internet Archive, State Library of Pennsylvania
Government Document Book -
46by Geyer, Alan R.“...Pennsylvania Bureau of Topographic and Geologic Survey,...”
Published 1982
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47by Froelich, A. J. (Albert Joseph), 1929-“...Dept. of the Interior, U.S. Geological Survey :...”
Published 1987
Government Document Microform Book -
48by Ratcliffe, Nicholas M. (Nicholas Morley), 1938-“...Dept. of the Interior, U.S. Geological Survey :...”
Published 1985
Government Document Microform Book -
49by Ratcliffe, Nicholas M. (Nicholas Morley), 1938-“...Dept. of the Interior, U.S. Geological Survey :...”
Published 1986
Government Document Microform Book -
50by Barnes, John Henry, 1946-“...Pennsylvania, Bureau of Topographic and Geologic Survey,...”
Published 1991
Government Document Book -
51Published 1926“...Dept. of Forests and Waters, Topographic and Geologic Survey,...”
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52by Newport, Thomas Gwyn, 1922-“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1973
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53Published 1939“...Department of Internal Affairs, Topographic and Geologic Survey,...”
Book -
54
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55by Taylor, Larry E. (Larry Eugene)“...The Survey : Copies from State Book Store,...”
Published 1983
Book -
56Published 1982“...The Survey : Purchased from State Book Store,...”
Book -
57by Lohman, S. W. (Stanley William), 1907-1992“...Dept. of internal affairs, Topographic and geologic survey,...”
Published 1938
Internet Archive, State Library of Pennsylvania
Book -
58by Epstein, Jack Burton, 1935-“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1993
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59by Senior, Lisa A.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1995
Government Document Book -
60by Wood, Charles R.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1996
Government Document Book