American Antiquarian Society 
Ancient Astronaut Society 
Arithmetic Assignment Statement 
Academy of Applied Science 
Academy of Applied Sciences 
Academy of Arts and Science 
Acedemiae Americanae Socius 
Advanced Application Specialist 
Afghanistan Academy of Sciences 
Air Ambulance Service 
Alabama Academy of Science 
Alcatel Alenia Space 
Aluminum Ammonium Sulfate 
American Astrophysical Society 
Ammoniacal Ammonium Sulfate 
Ammonium-Aluminum Silicate 
Anglesey Antiquarian Society 
Annunciator Alarm System 
Aquifer-Aquitard System 
Architectural Acoustics Society 
Arkansas Academy of Science 
Army Air Service 
Asian American Studies 
Asociación Argentina de Sedimentologia 
Association for Asian Studies 
Association of Architects and Surveyor… 
Astronomy and Astrophysics Supplement 
Atomic Absorption Spectroscope 
Atomic Absorption Standard 
Auckland Astronomical Society