References for the numbering systems

Col	Reference

---	---------

R1	Cuffey J. 1940, Astrophys. J. 92, 312

R2	Grubissich C. 1967, Z. Astrophys. 65, 105

R3	Hoag A.A., et al. 1961, Publ. US Nav. Obs. 17, 347  (pe)

R4	Hoag A.A., et al. 1961, Publ. US Nav. Obs. 17, 347  (pg)

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