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21Published 1999“...Fact sheet (Geological Survey (U.S.)) ;...”
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22Published 1999“...Fact sheet (Geological Survey (U.S.)) ;...”
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23Published 2000“...Fact sheet (Geological Survey (U.S.)) ;...”
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24by Dingler, John R.“...Fact sheet (Geological Survey (U.S.)) ;...”
Published 2000
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25Published 2000“...Fact sheet (Geological Survey (U.S.)) ;...”
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26Published 2000“...Fact sheet (Geological Survey (U.S.)) ;...”
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27Published 2000“...Fact sheet (Geological Survey (U.S.)) ;...”
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28Published 2000“...Fact sheet (Geological Survey (U.S.)) ;...”
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29by Alpers, Charles N., 1958-“...Fact sheet (Geological Survey (U.S.)) ;...”
Published 2000
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30Published 2001“...Fact sheet (Geological Survey (U.S.)) ;...”
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31Published 1999“...Fact sheet (Geological Survey (U.S.)) ;...”
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32by Fram, Miranda S. (Miranda Susan)“...Fact sheet (Geological Survey (U.S.)) ;...”
Published 2001
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33Published 2002“...Fact sheet (Geological Survey (U.S.)) ;...”
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34by Edwards, B. D.“...Fact sheet (Geological Survey (U.S.)) ;...”
Published 2002
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35by Hillhouse, John W.“...Fact sheet (Geological Survey (U.S.)) ;...”
Published 2002
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36Published 2003“...Fact sheet (Geological Survey (U.S.)) ;...”
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37Published 2003“...Fact sheet (Geological Survey (U.S.)) ;...”
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38Published 2003“...Fact sheet (Geological Survey (U.S.)) ;...”
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39Published 2003“...Fact sheet (Geological Survey (U.S.)) ;...”
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40Published 2003“...Fact sheet (Geological Survey (U.S.)) ;...”
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