40 inch telescope, Yerkes Observatory - Stock Image - C004/2128 - Science Photo Library
Yerkes Observatory Williams Bay Telescope Photograph by Tom Jelen - Fine Art America
The (Almost) Re-Opening of the Yerkes Observatory - Sky & Telescope - Sky & Telescope
Wisconsin 101
Yerkes Observatory - Wikipedia
Refracting telescopes: Use lenses (refraction); Important concepts are focal length and apert… | Astronomical observatory, Astronomical telescope, Largest telescope
Yerkes Observatory: Home of Largest Refracting Telescope | Space
Yerkes Observatory - Wikipedia
An end of an era at Yerkes Observatory
Yerkes Observatory Buildings, Instruments, Equipment, Grounds : Photographic Archive : The University of Chicago
Changes at Yerkes Observatory, An Artifact of Wisconsin's Astronomical Glory Days | WUWM 89.7 FM - Milwaukee's NPR
Yerkes Observatory | observatory, Williams Bay, Wisconsin, United States | Britannica
Williams Bay trying to maintain Yerkes Observatory as education center
Yerkes Observatory aims for resurrection as school for astronomy – Chicago Tribune
Yerkes Observatory - Wikipedia
Today's A Big Day': Wisconsin's Yerkes Observatory Has New Ownership | Wisconsin Public Radio
The Not-Quite Closing of Yerkes Observatory - Sky & Telescope - Sky & Telescope
Wisconsin 101
Homepage - Yerkes Observatory
Urban spelunking: Yerkes Observatory, which will soon reopen to the public
Discover Yerkes Observatory, largest refracting telescope - YouTube
Wisconsin's Yerkes Observatory—stargazing through the world's largest refracting telescope
Yerkes Observatory | Operating the World's Largest Refracting Telescope - YouTube
Homepage - Yerkes Observatory
Yerkes Future Foundation has big plans for Yerkes Observatory - Chicago Sun-Times
Yerkes Observatory – Williams Bay, Wisconsin - Atlas Obscura
