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2by Chase, Edith B.“...U.S. Geological Survey circular ;...”
Published 1983
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4Published 1982“...U.S. Geological Survey circular....”
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6Published 1983“...Geological Survey circular....”
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10“...Geological Survey circular ;...”
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11“...Geological Survey circular ;...”
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12by Foster, Helen Laura, 1919-“...Geological Survey circular ;...”
Published 1976
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13Published 1976“...Geological Survey circular ;...”
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14“...Geological Survey circular ;...”
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15Published 1976“...Geological Survey circular ;...”
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16
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17“...Geological Survey circular ;...”
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18“...Geological Survey circular ;...”
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19“...Geological Survey circular ;...”
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20“...Geological Survey circular ;...”
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