Coal mines and mining. Investigation of mine explosion at Centralia, Ill., hearings before special subcommittee, 80th Congress, 1st session, pursuant to S. Res. 98, to investigate explosion at Centralia coal mine no. 5. Wamac, Ill., on Mar. 25, 1947: Apr. 3, 4, 5, 10, 16, and 17, 1947.