Search U.S. government technical reports digitized or harvested by TRAIL.
Methods and costs of sinking a circular concrete-lined ventilation shaft
Methods and costs of shaft sinking in the Coeur d'Alene District, Shoshone County, Idaho
A study of dust-control methods for continuous mining of coal
Ventilation of continuous-miner places in coal mines
Electronic monitoring of mine fans
Miniature oxygen deficiency alarm
Radiation-ventilation relationships in six underground uranium mines