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REFERENCES

  1. Abell, G. O. 1958, Ap. J. Suppl., 3, 211.
  2. Abell, G. O. 1965, Ann. Rev. Astr. and Ap., 3, 1.
  3. Abell, G. O. 1975, in Stars and Stellar Systems, Vol. 9, Galaxies and the Universe, ed. A. Sandage and M. Sandage (Chicago: University of Chicago Press) (in press).
  4. Baade, W., and Minkowski, R. 1954, Ap. J., 119, 215.
  5. Bautz, L. P., and Morgan, W. W. 1970, Bull. A.A.S. (in press).
  6. Dewhirst, D. W. 1959, Paris Symposium on Radio Astronomy, ed. R. N. Bracewell (Stanford, Calif.: Stanford University Press), p. 507.
  7. Maltby, P., Matthews, T. A., and Moffet, A. T. 1963, Ap. J., 137, 153.
  8. Matthews, T. A., Morgan, W. W., and Schmidt, M. 1964, Ap. J., 140, 35.
  9. Morgan, W. W. 1962, Ap. J., 135, 1.
  10. Schmidt, M. 1965, Ap. J., 141, 1.
  11. Zwicky, F., Herzog, E., and Wild, P. 1961, Catalogue of Galaxies and of Clusters of Galaxies, Vol. 1 (Pasadena: California Institute of Technology), p. iii.