http://pec.lib.wvu.edu/record/P194681938State regulations pertaining to the use of internal-combustion engines in coal and metal mines and in tunnels.<p> Serial issue. Issued as: United States. Bureau of Mines. <em>Information circular</em>, 7019 (1938:June).</p>Gleim, E. J. (Ernest J.)Ilsley, L. C. (Lee Clyde), 1880-Tunnels--Safety measures.Mine safety--United States.Internal combustion engines--Safety measures.14256