Miners. Welfare of miners, hearings before subcommittee, 80th Congress, 1st session, Apr. 3 and 22, 1947; statements of John L. Lewis [and] J. A. Krug; with reports of committee appointed by Dwight H. Green to investigate Centralia mine disaster, and report of Bureau of Mines, Department of Interior, relative to Centralia mine disaster appended.

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