Experimental Longwall Mining in A Pennsylvania Anthracite Mine
Subtitle: (in Two Parts) : 1. Use of Yielding Steel Props.
Contributors: Brennan, R.; Buch, J.; Navrocky, E.
Series: Report of investigations (United States. Bureau of Mines) -- 6378
Publisher: s.n
Published: 1964
Place of publication: S.l
Language: eng
Notes: 1