Keywords: monochrome LC-USZ62-92265: Dr. Harry E. Burton, Principal Astronomer at the Naval Observatory, Washington, D.C. at the big telescope, June 7, 1937. (8/21/2015). LC-USZ62-92265: Dr. Harry E. Burton, Principal Astronomer at the Naval Observatory, Washington, D.C. at the big telescope, June 7, 1937. (8/21/2015). |