Labor and laboring classes. Employment of labor on Federal construction work, hearings, 71st Congress, 2d session, on H. R. 7995, to require contractors and subcontractors engaged on public works of United States to give certain preferences in employment of labor, H. R. 9232, to regulate rates of wages to be paid to laborers and mechanics employed by contractors and subcontractors on public works of United States and of District of Columbia, Mar. 6, 1930.

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