"National (U.S.) Optical Astronomy Observatory" . . . . . . . . . . . . "US National Optical Astronomy Observatories" . . . . . "National Optical-Infrared Astronomy Research Laboratory" . "NOAO's" . . "National Optical Astronomy Observatory" . "National Optical Astronomical Observatories" . "NOAO" . "National Optical Astronomy Observatory (NOAO)" . . . "National Optical Astronomy Observatories" . "NOAO Gemini Science Center" . . "National Optical Astronomy Observatory" .