Search U.S. government technical reports digitized or harvested by TRAIL.
Permissible explosives, mining equipment, and apparatus, approved prior to March 15, 1922
Use of ethyl mercaptan to detect leaks in natural-gas distribution systems
Rock-Strata Gases of the Cripple Creek District, Colorado and Their Effect on Mining
Typical Analyses of Coals of the United States
Tests of the heliopore coal carbonization power plant process