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The various Study Units of the ATA
African American (see Ebony Society)
Aircraft Unit (2004): A study of aircraft of the world on stamps and covers.
Americana Unit (1951): History, culture, and industry of the USA World-wide
Animals (see Biology)
Antarctica and Arctic (see Polar)
Archaeological (Old World) Study Unit (1977): The study of man and culture until 1200AD
Art and Artists (see Fine & Performing Arts and Durer)
Astronauts (see Space)
Astronomy Study Unit (1972): Astronomy, astrology, zodiac
Authors (see Journalists)
Bicycle Stamp Club (1987): Bicycles
Biology Unit (1951): Animal and plant life, present and prehistoric
Birds (see Biology)
Botany (see Biology)
Butterflies (See Lepidopterists)
Canadiana Study Unit (1988): History, culture, and industry of Canada worldwide
Captain Cook Society (1975): Life and voyages of Captain James Cook
Carto-Philatelic Society (1955): Globes and maps
Cats on Stamps Study Unit (1985): Domestic and wild felines
Chemistry & Physics Study Unit (1979): Chemistry and physics
Chess on Stamps Study Unit (1979): Chess, other board games
Christmas Philatelic Club (1986): Sacred and secular aspects of Christmas
Christopher Columbus Philatelic Society (1982): Life and voyages of Christopher Columbus
Computers (see Mathematical)
Dentistry (see Medical Subjects)
Dogs (See Biology)
Earthquakes (See Earth's Physical Features)
Earth's Physical Features Study Unit (1977): Earthquakes, environment, meteorology, mountains, oceanography, rivers, volcanoes
Ebony Society of Philatelic Events & Reflecting (ESPER) (2000): African American heritage worldwide
Embroidery (see Textiles)
Europa Study Unit (1959): All aspects of a United Europe
Fairytales and Folklore (see Journalists)
Fine & Performing Arts Philatelists (1986): Art, artists, cinema, circus, music, theater
Fire Service in Philately (1976): Fire fighting
Fish (see Biology)
Freemasonry (see Masonic)
Gay & Lesbian History on Stamps Club (1985): Life-styles
Gems-Minerals-Jewelry Study Unit (1976): Gems, jewelry, minerals
Globes (see Carto-Philatelists)
Golf Society, International Philatelic (1988): Golf and golfing
Graphics Philately Association: Books and Printing on Postage Stamps.
Insects (see Biology and Lepidopterists)
Journalists, Authors and Poets on Stamps (1974): Authors, journalists, poets
Lepidopterists Association (Philatelic) (1999): Butterflies and moths
Lighthouse Stamp Society (1994): Lighthouses worldwide
Maps (see Carto-Philatelists)
Mask Study Unit (1991): Masks
Masonic Study Unit (1979): Freemasonry
Mathematical Study Unit (1979): Computers, mathematics
Medical Subjects Unit (1952): Dentistry, nursing, pharmacy, physicians, Red Cross, veterinary medicine
Meteorology (see Earth's Physical Features)
Minerals (see Gems)
Molinology (see Windmills)
Moths (see Lepidopterists)
Mountains (see Earth's Physical Features)
Music (see also Fine Arts)
Napoleonic Age Philatelists (1983): Life and times of Napoleon Bonaparte
Natural Gas (see Petroleum)
Nursing (see Medical Subjects)
Oceanography (see Earth's Physical Features)
Petroleum Philatelic Society International (1988): Oil, natural gas, petro-chemical industry
Pharmacy (see Medical Subjects)
Physics (see Chemistry)
Pitcairn Islands Study Group (2000): Pitcairn settlers past and present
Poets (see Journalists)
Polar Philatelists, American Society of (1993): Antarctica and Arctic
Prehistory (fossils and dinosaurs) (see Biology)
Printing (see Graphics)
Railroad Unit, Casey Jones (1950): Trains, railroads, streetcars
Red Cross (see Medical Subjects)
Religion on Stamps, Collectors of (1943): All forms of religion
Reptiles (see Biology)
Rivers (see Earth's Physical Features)
Rotary on Stamps Fellowship (1952): Rotary International
Scouts on Stamps Society International (1990): Scouting
Ships on Stamps Unit (1952): All types of watercraft
Space Unit (1957): Astronauts/astronautics
Sports Philatelists International (1982): Olympics, recreation, sports
Stamps on Stamps Collectors Club (1959): Stamp-on-stamps, stamp centenaries
Textiles Study Unit (1977): Textiles from fiber to finished fabric, including production processes
Theater (see Fine & Performing Arts)
Trains (see Railroads)
United Nations Philatelists (1977): Worldwide UN related philately
Veterinary Medicine (see Medical Subjects)
Volcanoes (see Earth's Physical Features)
Watercraft (see Ships)
Windmill Study Unit (1974): Molinology
Wine on Stamps Study Unit (1995): Grapes and wine
Zodiac (see Astronomy)
Zoology (see Biology)
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