Mt. Hamilton Telescopes: Great Lick 36-inch Refractor
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Perkins Telescope Observatory
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File:Refracting telescope of the Strasbourg observatory.jpg - Wikimedia Commons
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University Observatory | American Public University System (APUS)
Star attraction: Royal Observatory seeks volunteers to use new telescope | Astronomy | The Guardian
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106,323 Observatory Images, Stock Photos & Vectors | Shutterstock
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