Observatory Link
The National Optical Astronomy Observatory is the national center for ground-based nighttime astronomy in the United States and is operated by the Association of Universities for Research in Astronomy (AURA). under cooperative agreement with the National Science Foundation. This web site links Kitt Peak National Observatory, Cerro Tololo Inter-American Observatory and NOAO System Science Center. http://ast.noao.edu/
Anglo-Australian Observatory  
Bradford University Telescope  
European Southern Observatory  
Isaac-Newton Group  
US Naval Observatory