Feasibility study of mining coal in an oxygen free atmosphere: a demonstration of a new mining technique to prevent the formation of mine acid in an active deep mine: phase I
Island Creek Coal Company. Island Creek Division, NUS Corporation. Cyrus Wm. Rice Division, United States. Federal Water Quality Administration
[U.S. Federal Water Quality Administration]; for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1970 - Technology & Engineering - 163 pages
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