Anthracite Mechanical-Mining Investigations
Subtitle: Use of Yielding Steel Supports (Props) in Combination with Backfilling For Mining Thick, Flat Beds.
Contributors: Hartley, J.; Cooner, J.; Brennan, R.
Series: Report of investigations (United States. Bureau of Mines) -- 5290
Publisher: s.n
Published: 1957
Place of publication: S.l
Language: eng
Notes: 1