Specialist society, concerned with delayed and/or damaged mail and interrupted mail services. Samples of covers; information on the society; index of the quarterly journal "La Catastrophe".

Collection and study of philatelic items associated with the Russian Empire, the Soviet Union and Republics.

International society focuses on postal history, particularly of current or former British Commonwealth nations.

Group focuses on study of the postal history of Wales.

The site features photos, data, and values, including newsletter back issues and a section of U.S. booklets.

Official site features society news, resources and membership information.

Devoted to the collection, study and exhibition of the issues and postal history of the United Nations.

Information about postage, mail, postal issues, philately, hobbies, stamp hobbies in UK.

International group focuses on the collection and study of envelopes, cards, and other items.

Worldwide group focuses on philately related to past and present states and colonies in Africa. Includes membership details, an application form and a list of available publications.