Search U.S. government technical reports digitized or harvested by TRAIL.
Methane in California gold mines
Underground hygiene and sanitation
Fire and ventilation doors in metal mines
Compressed-air blowers as an aid to metal-mine ventilation
Use of geophone in locating compressed-air leaks
Distribution of air in metal-mine ventilation with especial reference to flexible tubing methods
Carbon-monoxide hazards from tobacco smoke
Fatal accident from entering unventilated raise after blasting