Basic Estimated Capital Investment and Operating Costs For Underground Bituminous Coal Mines Developed For Longwall Mining
Subtitle: Mines with Annual Production of 1.3 and 2.6 Million Tonbs by Longwall Mining From A.
Series: Information circular (United States. Bureau of Mines) -- 8720
Publisher: s.n
Published: 1976
Place of publication: S.l
Language: eng
Notes: 1