Paul W. Merrill (face hidden) at the slit of the Coude spectrograph, Mount Wilson Observatory. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Merrill, Paul W. (Paul Willard), 1887-1961 Spectrograph Astronomical instruments Mount Wilson Observatory Mount Wilson (Calif.) Scientists Astronomers Photographic prints. (gmgpc)
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