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Testimony of John L. Lewis before the special Subcommittee on Mine Safety of the Committee on Labor and Public Welfare, United States Senate, Washington, D.C., January 29, 30, 1952, and before the Subcommittee on Mine Safety Legislation of the Committee on Education and Labor, United States House of Representatives, Washington, D.C., February 21, 1952
- "Testimony of John L. Lewis before the special Subcommittee on Mine Safety of the Committee on Labor and Public Welfare, United States Senate, Washington, D.C., January 29, 30, 1952, and before the Subcommittee on Mine Safety Legislation of the Committee on Education and Labor, United States House of Representatives, Washington, D.C., February 21, 1952"@en