1
Author: Willard, Bradford.
Published 1939
Record Source: Published Materials
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2
Author: Willard, Bradford, 1894-
Published 1958
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3
Author: Willard, Bradford, 1894-
Published 1938
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4
Author: Willard, Bradford, 1894-
Published 1938
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5
Author: Willard, Bradford, 1894-
Published 1932
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6
Author: Willard, Bradford, 1894-1973.
Published 1962
Record Source: Published Materials
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7
Author: Willard, Bradford, 1894-1973.
Published 1938
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8
Author: Cathcart, Stanley Holman.
Published 1931
Record Source: Published Materials
Contributors: '; “...Willard, Bradford....”
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9
Published 1959
Record Source: Published Materials
Contributors: '; “...Willard, Bradford, 1894-...”
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10
Author: Swartz, F. M.
Published 1939
Record Source: Published Materials
Contributors: '; “...Willard, Bradford....”
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11
Author: Barnes, John Henry, 1946-
Published 2002
Record Source: Published Materials
Contributors: '; “...Willard, Bradford, b. 1894....”
The geological story of Pennsylvania.
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12
Published 1939
Record Source: Published Materials
Contributors: '; “...Willard, Bradford....”
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13
Author: Butts, Charles, 1863-1946.
Published 1939
Record Source: Published Materials
Contributors: '; “...Willard, Bradford, 1894-...”
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14
Author: Butts, Charles, 1863-1946.
Published 1939
Record Source: Published Materials
Contributors: '; “...Willard, Bradford. 1894-...”
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15
Author: Miller, Benjamin L. 1874-1944.
Published 1939
Record Source: Published Materials
Contributors: '; “...Willard, Bradford, 1894-...”
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Geology Mines and mineral resources Geology, Stratigraphic Natural gas Paleontology Paleozoic Physical geography Stratigraphic Topography Topography and geography