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21Published 2001“...U.S. Geological Survey ;...”
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22
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23by Conger, Randall W.“...U.S. Geological Survey ;...”
Published 1999
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24by Rasmussen, Patrick P.“...U.S. Geological Survey ;...”
Published 2003
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25by Bradley, Michael W.“...U.S. Geological Survey ;...”
Published 1985
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26by Breault, Robert F.“...U.S. Geological Survey,...”
Published 2004
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27by Kay, Robert T.“...U.S. Geological Survey,...”
Published 2006
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28
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29
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30by Eckhardt, David A.“...U.S. Geological Survey,...”
Published 2007
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31by Dodge, Kent A.“...U.S. Geological Survey,...”
Published 2007
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32by Langland, Michael J.“...U.S. Geological Survey,...”
Published 2007
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33by Schaap, Bryan D.“...U.S. Geological Survey,...”
Published 2004
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34
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35
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36
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37
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38Published 2008“...U.S. Geological Survey,...”
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39by McHale, Michael R.“...U.S. Geological Survey,...”
Published 2007
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Government Document eBook -
40