British Censorship of Civil Mails During World War I, 1914–1919, by G Mark.

Published by The Stuart Rossiter Trust Fund, 2010.  S/B, 312pp.

This reprint of Graham Mark's 2000 publication is supplied with a 22-page March 2009 cumulative supplement containing new information.  The original book covers mails sent to and from enemy countries (including colonies and occupied areas of these countries), Allied countries in Europe, neutral countries in Europe, and Asia, Australasia, Africa, North America, Central America, and South America.  There are also chapters on undercover mail, inland and transit mails, Admiralty censorship, prisoners of war and internees' mails, exemptions from censorship, and special types of mail, such as express censorship, philatelists' mail, hand carried letters, etc.  Examples of postal history, censors' slips, labels, handstamps, and registration etiquettes are illustrated in black and white.