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1
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2by Flint, Lorraine E.“...U.S. Geological Survey :...”
Published 1990
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3
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4by Harmsen, S. C.“...U.S. Geological Survey :...”
Published 1991
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5by Langenheim, Victoria E.“...U.S. Geological Survey ;...”
Published 1991
Government Document Microform Book -
6by Ponce, David A.“...U.S. Geological Survey ;...”
Published 1992
Government Document Microform Book -
7by Nelson, Philip H.“...U.S. Geological Survey :...”
Published 1993
Government Document Microform Book -
8by O'Brien, Grady M.“...U.S. Geological Survey :...”
Published 1995
Government Document Microform Book -
9by Hale, Glenn S.“...U.S. Geological Survey ;...”
Published 1995
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10by Moyer, Thomas C.“...U.S. Geological Survey :...”
Published 1996
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11by La Camera, Richard J.“...U.S. Geological Survey ;...”
Published 1996
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12
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13Published 2000“...U.S. Geological Survey,...”
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14Published 1994“...U.S. Geological Survey :...”
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15
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16Published 2006“...U.S. Geological Survey,...”
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17by Whelan, Joseph F.“...U.S. Geological Survey,...”
Published 1998
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18by O'Brien, Grady M.“...U.S. Geological Survey,...”
Published 1998
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19
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20by Geldon, Arthur L.“...U.S. Geological Survey,...”
Published 1998
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