Keywords: blackandwhite monochrome black and white LC-USZ62-91645: U.S. Naval Observatory, Washington, D.C. Man is shown looking through large telescope, circa 1904. (8/21/2015). LC-USZ62-91645: U.S. Naval Observatory, Washington, D.C. Man is shown looking through large telescope, circa 1904. (8/21/2015). |