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Diagram%20Reflector%20RitcheyChretien.svg
Diagram%20Reflector%20RitcheyChretien.svg
http://commons.wikimedia.org/wiki/Special:FilePath/Diagram%20Reflector%20RitcheyChretien.svg
Ritchey–Chrétien telescope
P18
Q1062138-FA985C37-8E72-403E-B53D-34A8CDA909A2
P18
Diagram%20Reflector%20RitcheyChretien.svg
http://commons.wikimedia.org/wiki/Special:FilePath/Diagram%20Reflector%20RitcheyChretien.svg