Suggested minimum performance specifications for underground coal mine environmental monitoring systems / by J.H. Welsh, A.F. Cohen, and J.E. Chilton.
|Main Author:||Welsh, Jeffrey H.|
|Other Authors:||Cohen, A. F. , Chilton, J. E.|
[Pittsburgh, Pa.] : U.S. Dept. of the Interior, Bureau of Mines, 
Coal mines and mining
> Environmental aspects.
39 p. :
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