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YERKES OBSERVATORY TOUR 2021 - World's Largest Refracting Telescope! .
Leah Takes Over the VLog | Yerkes Observatory Trip | Autism Family .
Inside the World's Largest Refractor at Yerkes Observatory: Explore Scientific Experiences .
Keep on Exploring with Veronica Yerkes Observatory (Full Episode) .
Yerkes Observatory .
Yerkes Observatory Highlight Video 2018 .
The Architecture of Yerkes Observatory .
Discover Yerkes Observatory, largest refracting telescope .
Keep on Exploring with Veronica Yerkes Observatory Up close with the Telescope Part 4 .
Underground Lake Geneva - Yerkes Observatory .

Wikipedia (中)