Search U.S. government technical reports digitized or harvested by TRAIL.
Coal reserves of the Matewan quadrangle, Kentucky :a coal recoverability study
COALVAL, a prefeasibility software package for evaluating coal properties using Lotus 1-2-3, release 2.2 :documentation and user's guide
Roof control strategies for underground coal mines
A manganese consumption and recycling flow model
Comparison of small mines and small businesses :health and safety barriers and intervention strategies