1. Leaching rates of coal associated metals;AKERS,1978
2. Pneumoconiosis study in Central Pennsylvania coal mines. II;BAIER;J. occup. Med.,1961
3. Environmental dust study of anthracite coal mines in Eastern Pennsylvania;BAIER;J. occup. Med.,1963
4. Total dust, coal, free silica and trace metal concentrations in bituminous coal miner's lungs;CARLBERG;Am. Ind. Hyg. Ass. J.,1971
5. A washability and analytical evaluation of potential pollution from tracer elements in coal;CAVALLARO,1978