Anthracite mechanical-mining investigations :
- 出版日期：1956.
- 出版者：U.S. Dept. of the Interior, Bureau of Mines,
- 页数：ii, 29 p. :
- 出版地：Washington, D.C. :
- 第一责任说明：by John C. Hartley, John D. Cooner, Robert J. Brennan.
- 尺寸：28 cm.
- 分类号：a713 ; a873.1
MARC全文
02h0057711 20140617080953.0 s1956 dcuab fr |000|||eng | CNY200.00 NGL a713 ; a873.1 Hartley, John C. Anthracite mechanical-mining investigations : use of yielding steel supports (props) in combination with backfilling for mining thick, flat beds / by John C. Hartley, John D. Cooner, Robert J. Brennan. Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1956. ii, 29 p. : ill., maps ; 28 cm. Report of investigations (United States. Bureau of Mines) ; 5290 Coal-mining machinery. ; Anthracite coal industry. aBrennan, Robert J. ; aCooner, John D. Report of investigations (United States. Bureau of Mines) ; 5290. aCN bNGL 010001 P 720.66 R29u v5290 ; rCNY200.00 ; h1 whx011