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81Published 1976“...Report of investigations (United States. Bureau of Mines) ;...”
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82“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
83“...Report of investigations (United States. Bureau of Mines) ;...”
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84by Blasko, Donald P.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
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85by Powell, James A.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
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86Published 1976“...Report of investigations (United States. Bureau of Mines) ;...”
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87“...Report of investigations (United States. Bureau of Mines) ;...”
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88“...Report of investigations (United States. Bureau of Mines) ;...”
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89by Tisot, Peter R.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1975
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90Published 1975“...Report of investigations (United States. Bureau of Mines) ;...”
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91by Kuehn, D. G.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1975
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92“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
93“...Report of investigations (United States. Bureau of Mines) ;...”
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94by Cavallaro, J. A.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
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95“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
96“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
97“...Report of investigations (United States. Bureau of Mines) ;...”
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98by Wilson, Donald A.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
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99by Tweeton, Daryl R.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
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100Published 1976“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book