Advertisement inviting proposals for carrying mails by pneumatic tubes or similar devices at Boston, Mass.; borough of Brooklyn in city of New York, N.Y.; New York, N.Y.; Philadelphia, Pa.; Pittsburg, Pa.; Baltimore, Md.; Cincinnati, Ohio; Chicago, Ill.; Kansas City, Mo.; St. Louis, Mo.; and San Francisco, Calif.
Contributors: United States. Postmaster General.
Publisher: U.S. G.P.O.
Published: 1906
Place of publication: [Washington?]
Format: Microform
Subjects: Pneumatic-tube transportation.