self-stick,stamps were introduced in the United States in 1974 but were not successful; they were reintroduced in 1994 and now comprise the vast majority of U.S. stamps issued. The computer age came to U.S. postage stamps in 1999, when, as PC Postage, they became available for purchase and downloading on the Internet . The popularity of philately has led some governments to issue a great many stamps, usually commemoratives. Some small countries, like San Marino, receive much of their revenue by issuing stamps attractive to collectors.
See Scott's Standard Postage Stamp Catalogue (annual, 1868–), G. Schenk, The Romance of the Postage Stamp (1962); A. S. B. New, The Observer's Book of Postage Stamps (1967); D. J. Lehnus, A Guide to the Persons, Objects, Topics, and Themes on United States Postage Stamps, 1847–1980 (1982); R. S. Carlton, The International Encyclopædic Dictionary of Philately (1997).
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