1. Mail routes. Schedule of mail routes, no. 531, May 14, 1940, 3d division, Railway Mail Service, comprising District of Columbia, Maryland, North Carolina, Virginia, and West Virginia (except peninsula of Maryland and Virginia). Bookmark Corporate/Agency Authors: Railway Mail Service, International Postal Service Division, and Post Office Department Publisher: Railway Mail Service Date: [1940.] SuDoc number: P 10.12/3:531