Survey of the universe - Menzel, Donald H. (Donald Howard), 1901-1976.; Whipple, Fred L. (Fred Lawrence), 1906-2004; De Vaucouleurs, Gerard, 1918-1995 (Englewood Cliffs, N.J., Prentice-Hall, 1970)
Includes bibliographical references (pages 793-804).
Keywords: Astronomy; Astronomy