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Image: Yerkes Observatory Astro4p6

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Yerkes_Observatory_Astro4p6.jpg ‎(450 × 354 pixels, file size: 21 KB, MIME type: image/jpeg)

Description: Alvan Graham Clark and his assistant Carl Lundin (right) alongside of the 40-inch Lens.
Title: Yerkes Observatory Astro4p6
Credit: Astronomy and Astrophysics Yerkes Observatory
Author: Photo Credit: Yerkes Observatory
Permission: Public domainPublic domainfalsefalse This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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