1. Arrhenius, G., Liang, S., MacDougall, D., Wilkening, L., Bhandari, N., Bhat, S., Lal, D., Rajogopalan, G., Tamhane, A. S., and Ventakavaradan, V.: 1971,Proc. Second Lunar Sci. Conf., Geochim. Cosmochim. Acta, Suppl. 2,3, 2583?2598.
2. Burnett, D. S. and Woolum, D. S.: 1974,Proc. Fifth Lunar Sci. Conf., Geochim. Cosmochim. Acta, Suppl. 5,2, 2061?2074.
3. Criswell, D. R.: 1975, this conference.
4. Curtis, D. and Wasserburg, G. J.: 1975, this conference.
5. Duke, M. B. and Nagle, J. S.: 1975, this conference.