Mechanical mining in some bituminous coal mines
Subtitle: Progress report 9, face haulage.
Contributors: Shields, J.; Dowd, J.
Series: Information circular (United States. Bureau of Mines) -- 7978
Publisher: s.n
Published: 1960
Place of publication: S.l
Language: eng
Subjects: Coal mines and mining -- United States.; Coal-mining machinery.
Notes: 1