"Mine man-trip and ambulance cars."; "Mechling, M. J.", "Sloman, Harold J. (Harold Jandorf)"; "Coal mines and mining--Safety measures.", "Mine safety."; "Sloman, Harold J. (Harold Jandorf)", "Mechling, M. J."; "1948"; "

Serial issue. Issued as: United States. Bureau of Mines. Information circular, 7435 (1948).

"; ""; "P19457"; "pec"; "Coal mines and mining--Safety measures.", "Mine safety."; "14256"; .