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- 49046257 contributor B1168823.
- 49046257 created "1949.".
- 49046257 date "1949".
- 49046257 date "1949.".
- 49046257 dateCopyrighted "1949.".
- 49046257 extent "ii, 38 p.".
- 49046257 issued "1949".
- 49046257 issued "1949.".
- 49046257 language "eng".
- 49046257 publisher "Washington, U.S. Govt. Print. Off.,".
- 49046257 subject "Coal mines and mining Explosives.".
- 49046257 subject "TN1 .U6 no. 716".
- 49046257 title "Tests on the ignition of natural gas-air mixtures by permissible explosives in the experimental coal mine, by H.P. Greenwald [and others]".
- 49046257 type "text".