11. Mail routes. Schedule of mail routes, no. 446, Feb. 17, 1947, 10th division, Railway Mail Service, comprising lower peninsula of Michigan, Minnesota, North Dakota, South Dakota, and Wisconsin. Bookmark Corporate/Agency Authors: Surface Postal Transport Division and Post Office Department Publisher: Surface Postal Transport Division Date: [Feb. 17, 1947] SuDoc number: P 10.12/10:446