Posts & Telegraphs; past and present : with an account of the telephone, and phonograph / William Tegg, F.R.H.S.
L'Union Postale Universelle : sa foundation et son développement 1874-1949: mémoire / UPU - Union Postale universelle
\Un pliego de cartas / Doctor Thebussem
Programming analysis of the postal service : A study in Public Enterprise Economics / Henry Tulkens