Group portrait of Mount Wilson and Hale Observatories research staff in the Hale Library, Pasadena. Eighteen (18) men, most of whom are wearing suits and ties, are posed in two rows in front of a wall of books. A portrait painting hangs in the center. The front row of men are seated in chairs. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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