Merrit, P. c. (1978). Coal age operating handbook of coal preparation: Coal age library of operating handbooks. Coal Age Mining Informational Services.
Chicago-viite (17. p.)Merrit, Paul c. Coal Age Operating Handbook of Coal Preparation: Coal Age Library of Operating Handbooks. New York: Coal Age Mining Informational Services, 1978.
MLA-viite (9. p.)Merrit, Paul c. Coal Age Operating Handbook of Coal Preparation: Coal Age Library of Operating Handbooks. Coal Age Mining Informational Services, 1978.
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