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valy

17 Feb 2014 14:35



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http://skywatcher.ro/Educatie/tiptelescop.htm
http://www.astrovest.ro/home/index.php?option=com_content&view=article&id=87:informatii-de-baza-despre-telescoape-schema-optica&catid=46:ajutor1&Itemid=11