References
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- Minerals Yearbook 1973 , U.S.B.M. , Washington , D.C. , 1975 .
- Anonymous , Innovative Clean Coal Technology Department , National Coal Council , Washington , D.C. , 1988 .
- G. U. Ehlert , D. E. Jenkinson and R. Peer “ Hyperbaric Pressure Filtration Innovative for Dewatering Coal Fines ”, Proceedings of Coal Prep 91 , Lexington , KY , April 30-May 2. 1991 , pp. 195 – 198 .