Instructions in methods of sampling and in the use of the Bureau of Mines portable orsat apparatus for analyzing mine gases
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書誌事項
Instructions in methods of sampling and in the use of the Bureau of Mines portable orsat apparatus for analyzing mine gases
（Miners' circular, 34 . Advances mine rescue training ; pt.2）
United States Government Printing Off., 1929
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注記
At head of title: U.S. Department of the commerce, Bureau of Mines
