Front cover image for Health safety in the coal mines, hearings before the Subcommittee on Labor ... 91-2, June 26, August 6, 7, and 14, and 17, 1970

Health safety in the coal mines, hearings before the Subcommittee on Labor ... 91-2, June 26, August 6, 7, and 14, and 17, 1970

Print Book, English, 1971