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21Published 2004“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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22by Brock, John C.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2006
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23Published 2006“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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24by Brock, John C.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2007
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25by Brock, John C.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2007
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26by Billingsley, George H.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2004
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27by Billingsley, George H.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2006
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28by Billingsley, George H.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2006
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29Published 2006“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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30by Hereford, Richard“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2003
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31by Miller, David M. (David MacArthur), 1951-“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2008
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32Published 2008“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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33by Horton, J. Wright“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2008
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34by Slate, Janet L.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2009
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35Published 2010“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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36by Southworth, Scott, 1957-“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2001
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37by Southworth, Scott“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2009
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38by Morton, Robert A.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2009
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39by Billingsley, George H.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2008
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40by Turner, Kenzie J.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2010
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