TY  - BOOK
ED  - United States.
TI  - A cost comparison of selected coal mines from Australia, Canada, Colombia, South Africa, and the United States
PY  - 1993///
CY  - [Washington, D.C.]
PB  - United States Dept. of the Interior, Bureau of Mines
KW  - Coal trade
KW  - Costs
KW  - Case studies
KW  - Coal mines and mining
ER  -