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1by McGlade, William G.“...[Commonwealth of Pennsylvania, Bureau of Topographic & Geologic Survey],...”
Published 1972
Book -
2by Geyer, Alan R.“...Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey,...”
Published 1972
Book -
3by McGlade, William G.“...[Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey],...”
Published 1967
Book -
4by McGlade, William G.“...Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1976
Book