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21
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23by Huntington, Thomas Gordon, 1952-“...U.S. Geological Survey,...”
Published 1996
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24by McConnell, James B.“...U.S. Geological Survey,...”
Published 1984
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25
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26by Brown, David P. (David Phillip), 1947-“...U.S. Geological Survey,...”
Published 1984
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27by Inman, Ernest J.“...U.S. Geological Survey,...”
Published 1983
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28
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29
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30
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31
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32by Inman, Ernest J.“...U.S. Geological Survey,...”
Published 1997
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33by Falls, W. Fred“...U.S. Geological Survey,...”
Published 1997
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34
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35by Pearman, J. L.“...U.S. Geological Survey,...”
Published 1991
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36
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37by Chapman, M. J. (Melinda J.)“...U.S. Geological Survey,...”
Published 1993
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38
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39
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40by Crandall, Christy A.“...U.S. Geological Survey,...”
Published 1996
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