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REFERENCES

  1. Morgan, W. W. 1958, Pub. A.S.P., 70, 364.
  2. Morgan, W. W. 1959, Pub. A.S.P., 71, 394.
  3. Morgan, W. W. and Mayall, N. U. 1957, Pub. A.S.P., 69, 291.