Search U.S. government technical reports digitized or harvested by TRAIL.
Injury experience in coal mining, 1967
Injury experience in coal mining, 1968
How to find abandoned oil and gas wells
Injury experience in coal mining, 1969
Methane emission from U.S. coal mines in 1973,a survey: a supplement to IC 8558
Coal recovery from bituminous coal surface mines in the eastern United States :a survey
Coal recovery from underground bituminous coal mines in the United States, by mining method