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21
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22by Schmidt, John C., 1950-“...U.S. Geological Survey,...”
Published 1995
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23
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24by Hindall, S. M.“...U.S. Geological Survey,...”
Published 1984
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25
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26
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27by Omang, R. J.“...U.S. Geological Survey,...”
Published 1992
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28
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29
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30by Cameron, Kenneth A.“...Dept. of the Interior, U.S. Geological Survey;...”
Published 1987
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31Published 1908“...Engraved and Printed by the U.S. Geological Survey,...”
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32by Rinella, Frank A.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1998
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33Published 1996“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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34by Haefner, Ralph J.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1999
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35Published 1998“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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36Published 1988“...U.S. Dept. of the Interior, U.S. Geological Survey :...”
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37by Trabant, Dennis“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1991
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38by Omang, R. J.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1992
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39by Brunstein, F. Craig“...[U.S. Dept. of the Interior, U.S. Geological Survey] :...”
Published 1993
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40Published 1994“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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