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1
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2by Lohr, E. W. (Edwin Wallace), 1897-, Brown, Paul N., Lamar, William L. (William Luther), 1905-“...Geological Survey circular ;...”
Published 1953
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3
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4by Lohr, E. W. (Edwin Wallace), 1897-“...Geological Survey circular ;...”
Published 1952
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5
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6by Newton, John G., 1929-“...U.S. Geological Survey circular ;...”
Published 1987
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7Published 1990“...U.S. Geological Survey circular ;...”
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8by Pratt, Walden P.“...U.S. Geological Survey circular ;...”
Published 1995
Government Document Book -
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10
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11by Macek-Rowland, Kathleen“...U.S. Geological Survey circular ;...”
Published 2001
Government Document Book -
12by Macek-Rowland, Kathleen“...U.S. Geological Survey circular ;...”
Published 2001
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13by Pratt, Walden P.“...U.S. Geological Survey circular ;...”
Published 1995
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14
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15
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16
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17
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18by Perry, Thomas Gregory, 1918-“...Illinois. State Geological Survey. Circular ;...”
Published 1962
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19by Rexroad, Carl Buckner, 1925-“...Illinois. State Geological Survey. Circular ;...”
Published 1963
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