Special event postmarks of the United Kingdom being a catalogue of postmarks used on mail posted at congresses, exhibitions, shows etc., and for anniversaries, from 1851 to 1983
Pearson, George R.(George Richard)
Finch, Alan.
Peachey, Colin G.(Colin Gilbert),1940-
British Postmark Society.
Hemel Hempstead British Postmark Society
1984
Previous ed.: London : G.R. Pearson, 1973
Commemorative postmarks