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21“...U.S. Dept. of the Interior, Bureau of Mines,...”
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22by Schaefer, Seth C.“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1976
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23“...U.S. Dept. of the Interior, Bureau of Mines,...”
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24by Andreuzzi, Frank C.“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1976
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25by Dupree, Walter G.“...Bureau of Mines, U.S. Dept. of the Interior,...”
Published 1975
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26“...U.S. Dept. of the Interior, Bureau of Mines,...”
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27“...U.S. Dept. of the Interior, Bureau of Mines,...”
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28“...U.S. Dept. of Interior, Bureau of Mines,...”
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29“...U.S. Dept. of the Interior, Bureau of Mines,...”
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30“...U.S. Dept. of the Interior, Bureau of Mines,...”
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31“...U.S. Dept. of the Interior, Bureau of Mines,...”
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32“...U.S. Dept. of the Interior, Bureau of Mines,...”
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33“...U.S. Dept. of the Interior, Bureau of Mines,...”
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34“...U.S. Dept. of the Interior, Bureau of Mines,...”
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35“...U.S. Dept. of the Interior, Bureau of Mines,...”
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36“...U.S. Dept. of the Interior, Bureau of Mines,...”
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37“...U.S. Dept. of the Interior, Bureau of Mines,...”
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38“...U.S. Dept. of the Interior, Bureau of Mines,...”
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39“...U.S. Dept. of the Interior, Bureau of Mines,...”
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40“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Book