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61Published 1976“...U.S. Dept. of the Interior, Bureau of Mines,...”
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62by Marr, Harold E.“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1976
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63by Guidotti, Ronald“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1975
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64“...U.S. Dept. of the Interior, Bureau of Mines,...”
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65“...U.S. Dept. of the Interior, Bureau of Mines,...”
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66by Biggs, Paul“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1976
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67“...U.S. Dept. of the Interior, Bureau of Mines,...”
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68“...U.S. Dept. of the Interior, Bureau of Mines,...”
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69“...U.S. Dept. of the Interior, Bureau of Mines,...”
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70“...U.S. Dept. of the Interior, Bureau of Mines,...”
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71by Stateham, Raymond M.“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1976
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72“...U.S. Dept. of the Interior, Bureau of Mines,...”
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73“...U.S. Dept. of the Interior, Bureau of Mines,...”
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74“...U.S. Dept. of the Interior, Bureau of Mines,...”
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75Published 1976“...U.S. Dept. of the Interior, Bureau of Mines,...”
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76“...U.S. Dept. of the Interior, Bureau of Mines,...”
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77“...U.S. Dept. of the Interior, Bureau of Mines,...”
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78Published 1976“...U.S. Dept. of the Interior, Bureau of Mines,...”
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79“...U.S. Dept. of the Interior, Bureau of Mines,...”
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80“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Book