1. Interlaboratory variability and accuracy in trace element analyses of coal;Obermiller,1987
2. The Quest for the Universal Trace Element Analyzer: Inductively Coupled Plasma-Mass Spectrometry Applied to Coal and Coal Derived Materials;Conrad,1988
3. Hydropyrolytic-ion chromatographic determination of fluoride in coal and geological materials;Conrad;Anal. Chem.,1988
4. ICP-MS determination of trace elements in coal and other geological materials;Conrad,1991
5. Trace element contents of commercial coals;Obermiller,1991