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61“...Report of investigations (United States. Bureau of Mines) ;...”
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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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65“...Report of investigations (United States. Bureau of Mines) ;...”
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66by Wells, R. R.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1956
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67by Eilertsen, N. A.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1958
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68“...Report of investigations (United States. Bureau of Mines) ;...”
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69“...Report of investigations (United States. Bureau of Mines) ;...”
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70by Maloney, Raymond P.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1967
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71by Ageton, Robert W.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1967
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72“...Report of investigations (United States. Bureau of Mines) ;...”
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73“...Report of investigations (United States. Bureau of Mines) ;...”
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74by Stroud, Raymond B.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1970
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75“...Report of investigations (United States. Bureau of Mines) ;...”
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76by Rutledge, F. A. (Franklin A.)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1953
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77“...Report of investigations (United States. Bureau of Mines) ;...”
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78by Thomas, Bruce I.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1957
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79by Wells, R. R.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1957
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80by Oppelt, W. H. (Walter H.)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1958
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