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1by Geyer, Alan R.“...Pennsylvania Bureau of Topographic and Geologic Survey,...”
Published 1982
Book -
2by McGlade, William G.“...[Commonwealth of Pennsylvania, Bureau of Topographic & Geologic Survey],...”
Published 1972
Book -
3by Geyer, Alan R.“...[Commonwealth of Pennsylvania, Bureau of Topographic & Geologic Survey],...”
Published 1970
Book -
4by Lapham, Davis M.“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1969
Book -
5by Geyer, Alan R.“...Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey,...”
Published 1972
Book -
6by Geyer, Alan R.“...Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1977
Book -
7by McGlade, William G.“...Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1976
Book -
8by Geyer, Alan R.“...Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1979
Book