Mobile post offices

The street railway postal service in San Francisco

by Wallace R. Beardsley and Robert W. Parkinson. And Seattle & Seattle R.P.O. / by Douglas N. Clark and Lawton Gowey.

Collection and distribution wagon service, 1896-1904

by James H. Bruns ; edited by Warren F. Kimball, Jr.

The street railway post offices of Saint Louis

by Robert G. Schultz.

T.P.O: A history of the travelling post offices of Great Britain

H. S Wilson

The travelling post offices of Egypt

by Peter A.S. Smith.

Victoria, the travelling post offices and their markings, 1865-1912

by J. R. W. Purves.

An introduction and guide to the travelling post offices of Great Britain

[by] A. M. Goodbody : edited by Peter Johnson.

Handstamps of the travelling post offices of New South Wales

by V. Frankenstein.

Norwegian travelling post offices

Arthur Chambers.

TPO: a history of the Travelling Post Offices of Great Britain

[by] H.S. Wilson.