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Curtis H Elder · Dept. of the Interior, Bureau of Mines
22 sayfa · 1977
Mine gases / Coal / Geology
Elder, Curtis, H. · Dept. of the Interior, Bureau of Mines
20 sayfa · 1977
Mine gases / Methane / Coal mines and mining / Safety measurers
Curtis H Elder · U.S. Dept. of the Interior, Bureau of Mines
17 sayfa · 1975
Hydraulic mining
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