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61“...Report of investigations (United States. Bureau of Mines) ;...”
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62by Good, P. C. (Philip C.)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
Government Document Book -
63“...Report of investigations (United States. Bureau of Mines) ;...”
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64by Tesch, Willard John“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
Government Document Book -
65“...Report of investigations (United States. Bureau of Mines) ;...”
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66by Guidotti, Ronald“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1975
Government Document Book -
67“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
68“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
69by Biggs, Paul“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
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70“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
71“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
72“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
73“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
74by Stateham, Raymond M.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
Government Document Book -
75“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
76“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
77“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
78Published 1976“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
79“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
80“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book