Construction worker guiding part of the second level of the piling onto the brick base for the 40 inch telescope, Yerkes Observatory. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
African American construction workers Construction workers--United States Yerkes Observatory Large astronomical telescopes Refracting telescopes Portrait Photographs. (aat) Photographic prints. (gmgpc)
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