Registered Postmarks of Canada's RPOs (Col)
Manufacturer: BNAPS Books Department
19th Century Registered Postmarks of Canada's Railway Post Offices, 2003 by Harrison, Horace. Plus a one-frame exhibit of 20th Century RPO Registry Marks Horace Harrison Exhibits. Outlines the use of railroads for delivery of mail. Colour version. BNAPS Exhibit Series #31. Spiral Bound, 128 pp.