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