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21“...Report of investigations (United States. Bureau of Mines) ;...”
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22“...Report of investigations (United States. Bureau of Mines) ;...”
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23by Yancey, H. F. (Harry Fagan), 1890-1970, Daniels, Joe, McMillan, E. R., Geer, M. R. (Max Richard), 1912-1981“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1943
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24“...Report of investigations (United States. Bureau of Mines) ;...”
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25“...Report of investigations (United States. Bureau of Mines) ;...”
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26by Selvig, W. A. (Walter Alfred), 1886-1972, Ode, W. H. (William Harlan), 1905-, Gibson, F. H. (Francis Harold), 1903-, Davis, J. D. (Joseph Dana), 1882-1956“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1943
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27“...Report of investigations (United States. Bureau of Mines) ;...”
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28by Huff, Wilbert J.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1944
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29by Ode, W. H. (William Harlan), 1905-“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1944
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30“...Report of investigations (United States. Bureau of Mines) ;...”
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31by Holt, Stephen P.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1946
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32“...Report of investigations (United States. Bureau of Mines) ;...”
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33“...Report of investigations (United States. Bureau of Mines) ;...”
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34by Taliaferro, David Benjamin, 1905-, Keithly, C. M., Jennings, Thomas (Writer on oil fields)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1944
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35“...Report of investigations (United States. Bureau of Mines) ;...”
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36“...Report of investigations (United States. Bureau of Mines) ;...”
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37by Stephenson, E. L. (Edgar Lee), 1909-1983“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1945
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38by Webber, B. S.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1946
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39by Heide, Harold E.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1946
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40by Wright, Wilford S.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1947
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