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