Coal mining cost mode. Volume 2. Users' guide for the underground coal mining cost model. Final report
Keyword(s):
1963 ◽
Vol 79
(900)
◽
pp. 378-384
2009 ◽
Vol 15
(1)
◽
pp. 1-6
◽
2015 ◽
Vol 78
◽
pp. 1-9
◽
Keyword(s):