1
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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2
Author: Harper, John A.
Published 1989
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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3
Author: Goodwin, Bruce K.
Published 1964
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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4
Author: Markowski, Antonette K.
Published 2001
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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5
Author: Ashley, Geo. H. 1866-1951.
Published 1933
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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6
Published 1973
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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Author: O'Neill, Bernard J., 1920-
Published 1977
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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8
Published 1958
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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9
Author: Barnes, John Henry, 1946-
Published 2001
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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10
Published 1985
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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11
Author: Stone, Ralph W. 1876-1964.
Published 1932
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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12
Published 1959
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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13
Published 1990
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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14
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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15
Author: Prosser, L. J.
Published 1990
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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16
Published 1920
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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17
Author: Wagner, Walter Richard, 1928-1974.
Published 1958
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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18
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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19
Author: Stone, Ralph W. 1876-1964.
Published 1930
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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20
Author: Delano, Helen L.
Published 2001
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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