- Apache Point Observatory - Consists of 3.5 meter, 2.5 meter, and 1.0 meter with projects, schedules, observing aids, and information for each.
- Berkeley Automated Imaging Telescopes - Information for the Leuschner Berkeley and the Katzman automatic imaging equipment.
- Cambridge Optical Aperture Synthesis Telescope - A multi-element optical interferometer with baselines of up to 100 meters, designed to observe stars with angular resolution as high as one thousandth of one arcsecond.
- Carnegie Observatories - Information for observers, calendar, publications and libraries, seminars and conferences, fellowship program, and links.
- InfraRed Telescope Facility - General information, observing information, instrumentation, facility systems, photo gallery, news, and links.
- Kitt Peak National Observatory - General information, image gallery, facility schedule, documentation, observation information, documentation, and electronic forms and tools.
- Large Sky Area Multi-Object Fiber Spectroscopic Telescope - Information, news, events and technical reports, documents, gallery, and links.
- Lowell Observatory - Research, education and outreach, mission, star tales, and links.
- Mount Laguna Observatory - Facilities, equipment and instrumentation information, virtual tour, site map, CCD camera laboratory and production, and resources.
- Mount Wilson Observatory - Projects, outreach and education, history, FAQ, news, and links.
- National Optical Astronomy Observatory - Information, news, resources, outreach programs, gallery, observing information, software, and newsletter and reports.
- Sloan Digital Sky Survey - A dedicated 2.5 meter telescope which uses sensitive electronic light detectors to systematically map a quarter of the sky, building a catalog of celestial objects, galaxies, and quasars. Data links, questions and answers, image gallery, project tour, news, archive, publications, and links.
- Spitzer Space Telescope - General information, articles, downloads, equipment information, news, and links.
- Steward Observatory - Equipment information, projects, calendar, talks, news, and links.
- Stratospheric Observatory for Infrared Astronomy - News and updates, education and public outreach, research information, and galleries.
- Tenagra Observatories - Operations, commercial time, facilities and equipment information, sites, discoveries, articles, and links.
- The Advanced Satellite for Cosmology and Astrophysics - Mission characteristics, science highlight, and archive.
- University of Wyoming Infrared Observatory - The WIRO 2.3-meter telescope is located near the summit of Jelm Mt. Includes information on its optical design, structure, the dome enclosure and observing.
- Visible and Infrared Survey Telescope for Astronomy - Consortium, science committee, project office, and downloads.
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