American Hospital Association American Heart Association Accelerated Hub Architecture American Humane Association Australian Hotels Association Activity Hazard Analysis Advanced Hardware Architectures African Humanitarian Action alert holding area alpha-hydroxy acid American Homebrew Association American Hyperlexia Association anterior hypothalamic area autoimmune hemolytic anemia acetohydroxamic acid acquired hemolytic anemia activity hazards analysis Adaptec Host Adapter Advanced Hardware Architects African Heritage Army Age-Hardenable Alloy Aim High Academy Air Alpha Greenland Airco Hydrogen-Atmosphere Aldrich humic acid Alpha-hydroxy acids American Hardboard Association American Heart Association's American Hereford Association American Hippotherapy Association