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Modernizing mine safety : hearing before the Subcommittee on Workforce Protections, Committee on Education and the Workforce, U.S. House of Representatives, One Hundred Twelfth Congress, first session, hearing held in Washington, DC, May 4, 2011
- "Modernizing mine safety : hearing before the Subcommittee on Workforce Protections, Committee on Education and the Workforce, U.S. House of Representatives, One Hundred Twelfth Congress, first session, hearing held in Washington, DC, May 4, 2011"@en
- "Modernizing mine safety : hearing before the Subcommittee on Workforce Protections, Committee on Education and the Workforce, U.S. House of Representatives, One Hundred Twelfth Congress, first session, hearing held in Washington, DC, May 4, 2011"@en
- "Modernizing mine safety hearing before the Subcommittee on Workforce Protections, Committee on Education and the Workforce, U.S. House of Representatives, One Hundred Twelfth Congress, first session, hearing held in Washington, DC, May 4, 2011"@en