edited by Michael J.S. Belton, Robert A. West, Jürgen Rahe ; with the assistance of Margarita PereydaNASA, National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division,1989
by Frank E. Ross and Mary R. Calvert; made from negatives secured at the Mount Wilson and Lowell observatories by Frank E. Ross, with the assistance of Kenneth NewmanThe University of Chicago press1934