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COSTSUM: a system for analysis of operational cost data from coal surface mines : a user's guide
Zipper, C. E., (1986)
Cost structures in the Australian export coal industry
Beck, Tony, (1989)
Yeraltı kömür işletmeciliğinde maliyet kontrolu standart maliyetler ile kontrol
Ergin, Hüseyin, (1987)
Sorting out materials issues
Fraser, Sam J., (1988)
Worldwide availability of silver
Boyle, Edward H., (1986)