Diagram of explosion area of Itmann No. 3 Mine, Itmann, WV, December 16, 1972, from the Historical Summary of Coal Mine Explosions in the United States, 1959-81, by J.K. Richmond, G.C. Price, M.J. Sapko, and E.M. Kawenski, Bureau of Mines Information Circular 8909, 1983. https://www.cdc.gov/niosh/mining/userfiles/works/pdfs/ic8909.pdf

Diagram of explosion area of Itmann No. 3 Mine, Itmann, WV, December 16, 1972, from the Historical Summary of Coal Mine Explosions in the United States, 1959-81, by J.K. Richmond, G.C. Price, M.J. Sapko, and E.M. Kawenski, Bureau of Mines Information Circular 8909, 1983. https://www.cdc.gov/niosh/mining/userfiles/works/pdfs/ic8909.pdf