-
21by Bucek, Milena F.“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1971
Book -
22by Dyson, James Lindsay, 1912-1967“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1967
Book -
23by Miller, J. T. (John T.), 1906-“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1971
Book -
24by Lapham, Davis M.“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1969
Book -
25by Walker, Roger G.“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1972
Book -
26by Geyer, Alan R.“...Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey,...”
Published 1972
Book -
27by Rudd, Neilson“...[Commonwealth of Pennsylvania. Bureau of Topographic and Geologic Survey],...”
Published 1972
Book -
28by Cramer, Howard Ross, 1925-“...Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey,...”
Published 1972
Book -
29by Crowl, G. H.“...[Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey],...”
Published 1971
Book -
30by Newport, Thomas Gwyn, 1922-“...[Topographic and Geologic Survey; may be purchased from Bureau of Publications],...”
Published 1971
Book -
31Published 1982“...Pennsylvania Department of Environmental Resources, Bureau of Topographic and Geologic Survey,...”
Map -
32by Wiswall, C. Gil“...Pennsylvania, Office of Parks and Forestry, Bureau of Topographic and Geologic Survey,...”
Published 1993
Internet Archive, State Library of Pennsylvania
Government Document Book -
33by McGlade, William G.“...[Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey],...”
Published 1967
Book -
34by Lytle, William S.“...[Commonwealth of Pennsylvania, State Planning Board, Bureau of Topographic & Geologic Survey],...”
Published 1970
Book -
35by Glover, Albert D.“...Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1978
Book -
36by Johnston, Herbert E.“...[Commonwealth of Pennsylvania, State Planning Board, Bureau of Topographic and Geologic Survey],...”
Published 1970
Book -
37by Poth, Charles W.“...[Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey],...”
Published 1968
Book -
38by Newport, Thomas Gwyn, 1922-“...Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1973
Book -
39by Poth, Charles W.“...Commonwealth of Pennsylvania Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1973
Book -
40by Poth, Charles W.“...Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1973
Book