Anthracite Mechanical-mining Investigations
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Anthracite Mechanical-mining Investigations
Use of Yielding Steel Supports (props) in Combination with Backfilling for Mining Thick, Flat Beds
Description
No description available
Book Details
- Publisher:
- U.S. Department of the Interior, Bureau of Mines
- Published:
- 1956
- Pages:
- 29
- Language:
- EN
- ISBN:
- Unknown