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- Author: United States. Bureau of Mines Remove filter Author: United States. Bureau of Mines
Coal
304
Mine safety
225
Explosives
151
Petroleum
121
Mine ventilation
106
Mine accidents
104
Mine dusts
74
Mine fires
73
Oil-shales
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Ore-dressing
68
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64
Methane
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Natural gas
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Mining law
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Flotation
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1970-1979
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1960-1969
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1930-1939
846
1920-1929
496
1950-1959
464
1980-1989
428
1940-1949
418
1931
222
1990-1999
215
1910-1919
186
1970
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1966
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1930
171
1963
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1972
159
1971
150
1974
147
1973
144
1976
142
1969
139
1965
124
1968
116
1932
115
1929
107
1956
103
1978
100
1933
86
1938
86
1967
86
1964
82