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1by Root, Samuel I.“...[Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey],...”
Published 1968
Book -
2by Root, Samuel I.“...[Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1971
Book -
3by Fauth, John L.“...Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic...”
Published 1978
Book