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21by Hornewer, Nancy J.“...U.S. Geological Survey,...”
Published 2008
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22
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23
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24Published 2008“...U.S. Geological Survey,...”
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25by Draut, Amy E.“...U.S. Geological Survey,...”
Published 2008
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26
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27by Coes, Alissa L.“...U.S. Geological Survey,...”
Published 2007
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28Published 2008“...U.S. Geological Survey,...”
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29
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30by Collins, Brian David“...U.S. Geological Survey,...”
Published 2009
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31by Johnson, Raymond H.“...U.S. Geological Survey,...”
Published 2009
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32
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33
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34
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35by Brown, Juliane B.“...U.S. Geological Survey,...”
Published 2008
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36
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37by Littin, G. R.“...U.S. Geological Survey,...”
Published 1987
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38by Carpenter, Michael C.“...U.S. Geological Survey,...”
Published 1987
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39
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