The postal laws and regulations pertaining to the second class of mail matter.
Promulgated by authority of the postmaster general.

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Item Link Original Source
Full view   Jan.1 1908 University of Michigan
Full view   July 1, 1909 University of Michigan
Full view   March 1, 1910 University of Michigan
Full view   Feb.1,1912 University of Michigan
Full view   July 1, 1914 University of Michigan
Full view   c.1 1914 University of Chicago