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All links of Christiaan
Centro Astronómico Hispano Alemán
Gemini Observatory
Paranal Observatory
Subaru Telescope
Palomar Observatory
Southern African Large Telescope
W. M. Keck Observatory
Canadian Aspects of the Thirty Metre Telescope
The MMT Observatory
McDonald Observatory
Christiaan related site:
de Jong, Christiaan
Bos, Paul Christiaan
MacTutor: Christiaan Huygens
Wikipedia: Christiaan Huygens
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