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A nice book about the famous ShortTube 80 Telescope! #telescope #astronomy https://t.co/PUqE3TZtYb https://t.co/GkIFJqB0a4
A nice book about the famous ShortTube 80 Telescope! #telescope #astronomy https://t.co/PUqE3TZtYb https://t.co/GkIFJqB0a4