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21“...Report of investigations (United States. Bureau of Mines) ;...”
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22“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
23“...Report of investigations (United States. Bureau of Mines) ;...”
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24by Stateham, Raymond M.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
Government Document Book -
25“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
26“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
27“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
28“...Report of investigations (United States. Bureau of Mines) ;...”
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29“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
30“...Report of investigations (United States. Bureau of Mines) ;...”
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31by Snodgrass, James J.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
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32by McCulloch, C. M. (Charles M.)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
Government Document Book -
33“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
34“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
35“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
36“...Report of investigations (United States. Bureau of Mines) ;...”
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37by Schaefer, Seth C.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
Government Document Book -
38“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
39“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
40“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book