Sampling and precision of measurements, R. Kratochvil; probability samples, judgement samples, and inference, C.D. Rose; total elemental analysis of coal by ICP - is it possible?, F.E. Lichte; ICP-IMS trace element determination in coal and other geological materials, V.B. Conrad; ICP in slurries, J.T. Riley; glow discharge mass spectrometry, J.C. Huneke; application of ion chromatography to the anlaysis of coal, J.A. Cox; determination of rare earths with ion chromatography, J.P. Willis; determination of organic sulfur with XAFS spectroscopy, F. Huggins; on-line determination of C in fly-ash, N.G. Cutmore; elemental analysis of coal and coal fly-ash by nuclear methods, V. Valkovic; removal and control of trace elements in coal and wastes, R. Markuszewski; coal-fired power plants as a source of environmental contamination by trace elements, J.M. Pacyna; and others.