1. Mail routes. Schedule of mail routes, no. 152, May 21, 1940, 15th division. Railway Mail Service, comprising Pennsylvania and main line of Erie Railroad west of Salamanca, N. Y., main lines of Baltimore & Ohio R. R. and Pennsylvania R. R. System west of Pittsburgh, Pa., and such collateral lines as may be designated. Bookmark Corporate/Agency Authors: Railway Mail Service, International Postal Service Division, and Post Office Department Publisher: Railway Mail Service Date: [May 24, 1940] SuDoc number: P 10.12/15:152