Modified Longwall Mining with A German Coal Planer
Subtitle: Progress Report 2. Completion of Mining in Three Adjacent Panels in the Pocahontas no.4 Bed, Helen, W. va.
Contributors: Haley, W.; Quenon, H.
Series: Report of investigations (United States. Bureau of Mines) -- 5062
Publisher: s.n
Published: 1954
Place of publication: S.l
Language: eng
Notes: 1