Cable and broadcasting act 1984 : chapter 46
The encyclopaedia of the british empire postage stamps : 1775-1950
Quadruplex telegraphy
Handbook for wireless telegraph operators : working installations licensed by his majesty's postmaster-general
The post office : an historical summary / Postmaster-General
Agreement between the United Kingdom and Portugal modifying the postal money order agreement of January 17, 1883 : signed at Lisbon, February 3, 1898