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State-of-the-art techniques for backfilling abandoned mine voids

Published: Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1993
Format: Microform, Microfiche
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Surface subsidence over a room-and-pillar mine in the western United States

Published: [Washington, D.C.?] : U.S. Dept. of the Interior, Bureau of Mines, 1993
Format: Microform, Microfiche
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