Search U.S. government technical reports digitized or harvested by TRAIL.
Rare and uncommon chemical elements in coal
Analyses of ash from coals of the United States
Determining phosphorous in coal and coke :evaluation of volumetric, colormetric, and gravimetric methods
Phosphorus, chlorine, sodium, and potassium in U.S. coals
Direct determination of oxygen in coal
Method for determination of fluorine in coal