"Effective rock-dusting of coal mines."; "Rice, George S. (George Samuel), 1866-1950."; "Mine explosions--Prevention.", "Coal dust.", "Mine explosions--Safety measures.", "Coal mines and mining--Safety measures."; "Rice, George S. (George Samuel), 1866-1950."; "1927"; "

Serial issue. Issued as: United States. Bureau of Mines. Information circular, circular no. 6039 (1927:June).

"; ""; "P20755"; "pec"; "Mine explosions--Safety measures.", "Coal mines and mining--Safety measures.", "Coal dust.", "Mine explosions--Prevention."; "14256"; .