Canada Post Office Guide - 1852 (Allan L. Steinhart, Cyrlox bound, 88 pages)

Canada's Pence Era, The Pence Stamps and The Canadian Mail 1851-1859 (George B. Arfken & Arthur W. Leggett & Charles G. Firby & Allan L. Steinhart, 1997, Hardbound, 421 pages)

Early American Perforating Machines and Perforations 1857-1867 (Winthrop S. Boggs, 1982, Stapled, 38 pages)