Some users also enter a number of codes including a two letter country code as well as an International Standard Industrial Classification, North American Industry Classification or US Standard Industrial Classification.
American | American Civil War | American Broadcasting Company | American football | North Carolina | North America | African American | American Idol | American Revolutionary War | North Rhine-Westphalia | American Revolution | North Korea | North Yorkshire | University of North Carolina at Chapel Hill | American Association for the Advancement of Science | American Red Cross | North Island | North Sea | North Africa | American Library Association | American Museum of Natural History | North Dakota | North | American Express | operating system | American Academy of Arts and Sciences | American League | American Association | American Heart Association | Raleigh, North Carolina |