1. Mail routes. Schedule of mail routes, no. 536, May 29, 1936, 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 and Panama Canal Publisher: Railway Mail Service Date: [May 29, 1936] SuDoc number: P 10.12/9:536