Books by Massachusetts Commission on Hours of Labor:
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Massachusetts Commission on Hours of Labor, 1866: Reports of Commissioners on the Hours of Labor (page images at MOA)
Additional books by Massachusetts Commission on Hours of Labor in the extended shelves:
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Massachusetts Commission on Hours of Labor, 1866: Reports of commissioners on the hours of labor Appointed under Chapter 92 of the Resolves of 1866. (Wright & Potter, state printers, 1867), also by Amasa Walker (page images at HathiTrust)
Find more by Massachusetts Commission on Hours of Labor at your library, or elsewhere.