Ships on Stamps Unit - Group supports collectors of stamps picturing ships, boats, and other watercraft. Lighthouse Stamp Society - Group publishes a bimonthly newsletter and promotes the collection of stamps, postal stationery, and other philatelic materials picturing lighthouses. Sports Philatelists International - Collectors of Olympic and sport-related stamps, postcards, and ephemera participate in theme-focused society. Old World Archaeological Study Unit - Focuses on postage stamps commemorating subjects related to ancient cultures. Americana Unit - Collectors' group specializes in stamps of all nations that honor the United States of America by depicting individuals, landmarks, and other subjects directly related to the country. Biology Unit - Associated with the American Topical Association, this group of collectors specializes in stamps picturing the flora and fauna of the world. Chemistry and Physics on Stamps Study Unit - Collectors in group specialize in stamps picturing scientists and science-related topics. Chess on Stamp Study Unit - Group of collectors specializing in stamps, postmarks, and other chess-related philatelic items provides a quarterly newsletter for members plus checklists for all collectors. Christopher Columbus Philatelic Society - Group of collectors specializes in stamps and other philatelic material commemorating the voyages of Christopher Columbus. Collectors of Religion on Stamps - Non-denominational group supports collectors of stamps and other postal material with a religious theme. Ebony Society of Philatelic Events and Reflections - Organization promotes the collection of stamps honoring African Americans and related topics, and encourages stamp collecting by African Americans. Europa Study Unit - Club promotes the collection of stamps featuring subjects related to the economic, political, and social integration of Europe. Graphics Philately Association - Club members promote the collection of stamps honoring books and the history of printing. Lions International Stamp Club - Group promotes the collection of stamps and covers honoring Lions Club International and Lions-related subjects. Mathematical Study Unit - Club members collect and share information about philatelic materials related to math, mathematicians, and computers. Napoléonic Age Philatelists - Group caters to collectors of stamps picturing Napoleon Bonaparte and Napoleonic-era topics. Penguins on Stamps Study Unit - Promotes the study and collection of philatelic material picturing or related to penguins, including stamps, postcards, postal stationery, and ephemera. Rotary on Stamps - Members of club collect stamps related to Rotary International. Space Topic Study Unit - Members of club are devoted to the study of covers and stamps related to space themes. Stamps on Stamps Collectors Club - By promoting communication between members and publishing a newsletter three times per year, organizations supports collectors of stamps picturing stamps. Wine on Stamps Study Unit - Group specializes in thematic stamps related to wine, wine production, and grapes, and publishes a quarterly journal with articles about such stamps. Astro Space Stamp Society - Group caters to collectors of space-related stamps, postcards, and covers, and publishes a quarterly magazine. Petroleum Philatelic Society International - Group supports collectors of stamps focused on oil, natural gas, and the petrochemical industry. Bird Stamp Society - Organization publishes a quarterly journal and oversees auctions and circuits for members who collect stamps picturing birds. Cats on Stamps Study Unit - Association of collectors of stamps and pictorial cancellations depicting cats publishes a quarterly journal and updates members on cat stamp-related news.