1. Bouska , V. 1981 .Geochemistry of coal.Amsterdam Elsevier . 284 pp.
2. Ford , C.T. , and A. A. Price . 1980 . Evaluation of the effects of coal cleaning on fugitive elements-Phase II . BCR Report. L-1082. Monroeville , PA Bituminous Coal Research, Inc .
3. Ford , C.T. , and A. A. Price . 1982 . Evaluation of the effects of coal cleaning on fugitive chemicals Phase HI. BCR Report L-1304 . Monroeville , PA Bituminous Coal Research , Inc .
4. Gluskoter , H.J. , R.R. Ruch , W.G. Miller , R.A. Cahill , G.B. Dreher , and J.K. Kuhn . 1977 . Trace elements in coal Occurrence and distribution. Illinois Geological Survey Circular 499 . 154 pp.
5. Use of the IMS-3f High Mass Resolving Power