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21“...United States Department of the Interior, Geological Survey,...”
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22by Welch, Stewart W.“...[United States Department of the Interior, Geological Survey],...”
Published 1958
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23by Ashley, Geo. H. (George Hall), 1866-1951, Glenn, L. C. (Leonidas Chalmers), 1871-1951“...Department of the Interior, United States Geological Survey,...”
Published 1906
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24“...United States Department of the Interior, Geological Survey,...”
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25by Tschudy, Robert H.“...United States Department of the Interior, Geological Survey,...”
Published 1970
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26by Tschudy, Robert H.“...United States Department of the Interior, Geological Survey,...”
Published 1973
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27by Kepferle, Roy Clark, 1926-“...United States Department of the Interior, Geological Survey,...”
Published 1977
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28Published 1979“...United States Department of the Interior, Geological Survey,...”
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29“...United States Department of the Interior, Geological Survey,...”
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30by Cressman, Earle Rupert, 1923-“...United States Department of the Interior, Geological Survey,...”
Published 1973
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31by Kosanke, Robert M. (Robert Max)“...United States Department of the Interior, Geological Survey,...”
Published 1973
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32by Tschudy, Robert H.“...United States Department of the Interior, Geological Survey,...”
Published 1975
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33“...United States Department of the Interior, Geological Survey,...”
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34“...United States Department of the Interior, Geological Survey,...”
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35by Karklins, Olgerts L., 1924-“...United States Department of the Interior, Geological Survey,...”
Published 1984
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36by Pope, John K.“...United States Department of the Interior, Geological Survey,...”
Published 1982
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37by Walker, Laurence G. (Laurence Graves), 1937-“...United States Department of the Interior, Geological Survey,...”
Published 1982
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38by Elias, Robert J.“...United States Department of the Interior, Geological Survey,...”
Published 1983
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39by Cressman, Earle Rupert, 1923-“...United States Department of the Interior, Geological Survey,...”
Published 1981
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40by McDowell, Robert C., 1935-“...United States Department of the Interior, Geological Survey,...”
Published 1983
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