1. Mail routes. Schedule of mail routes, no. 553, May 14, 1940, 9th division, Railway Mail Service, comprising lower peninsula of Michigan, main line of New York Central R. R. between New York, N. Y., and Chicago. Ill., and collateral lines that may be designated. Bookmark Corporate/Agency Authors: Railway Mail Service, International Postal Service Division, and Post Office Department Publisher: Railway Mail Service Date: [May 14, 1940.] SuDoc number: P 10.12/9:553