1. Arnold, J. R., Peterson, L. E., Metzger, A. E., and Trombka, J. I.: 1972,Apollo 15 Preliminary Science Report, NASA, Washington, D. C., 16?1.
2. Baldwin, R. B.: 1971,Phys. Earth Planetary Interiors 4, 167?179.
3. Boland, J. N. and Duba, A.: 1973, ?Microstructural Studies of Mg-Rich Orthopyroxenes?, m.s. in prep.
4. Bradley, R. S., Jamil, A. K., and Munro, D. C.: 1964,Geochim. Cosmochim. Acta 28, 1669?1678.
5. Brett, R.: 1972,Trans. Amer. Geophys. Union 53, 723.