NSRDS National Standard Reference Data System
American National Standard
attitude heading and position reference system
Attitude And Heading Reference System Apparatus
Attitude and Heading Reference System
altitude heading reference system
air data system and inertial reference system
office of standard reference data
elemental standard data system
the grade-two of the national standard
American national standard control character
national water data system
American national standard label
the setting up of national standard
the national standard sample
the National standard method