United States (USA) (US)

Amazon Industry / private company Seattle Ambry Genetics Industry / private company Aliso Viejo, CA American Association For The Advancement of Science (AAAS) Scientific academy / society / association Washington, D.C. American Association of Variable Star Observers (AAVSO) Scientific academy / society / association Cambridge, MA American Astronomical Society Research / Science organisation Washington, DC American Cancer Society Industry / private company Atlanta, GA American College of Cardiology Association Washington D.C. American College of Radiology University / College Reston, VA American Dental Association (ADA) Association Chicago American Heart Association (AHA) Association Dallas