Antique Advertising Association of America - Organization for collectors of antique advertising. Specializes in advertising tins and signs; advertising displays; bottles; trade cards; calendars. Many just specialize in a specific area such as tobacco, beer, soda, typewriter, and oil.
The Ephemera Society of America, Inc. - A non-profit organization devoted to furthering the collection, study, and preservation of ephemera (paper items).
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