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21by Rhea, Susan“...U.S. Geological Survey,...”
Published 1995
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22by Chastain, Robert A.“...U.S. Geological Survey,...”
Published 2006
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Government Document Book -
23by May, Thomas W.“...U.S. Geological Survey,...”
Published 2007
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24by Kucks, R. P.“...U.S. Geological Survey,...”
Published 2005
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25by Smith, Brenda J. (Brenda Joyce), 1953-“...U.S. Geological Survey,...”
Published 2006
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26by Weary, David J.“...U.S. Geological Survey,...”
Published 2008
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27
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28
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29Published 1997“...U.S. Geological Survey ;...”
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30Published 1979“...U.S. Geological Survey,...”
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31
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32Published 2008“...U.S. Geological Survey,...”
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33by Mugel, Douglas N.“...U.S. Geological Survey,...”
Published 2009
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Government Document eBook -
34by Pope, Larry M.“...U.S. Geological Survey,...”
Published 2009
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35
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36
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37by Anderson, Kenneth Hartley, 1923-“...U.S. Geological Survey,...”
Published 1979
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38
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39Published 1979“...U.S. Geological Survey,...”
Government Document Map -
40