1. Arnold, J. R., Peterson, L. E., Metzger, A. E., and Trombka, J. I.: 1972a, ?Gamma-Ray Spectrometer Experiment?, Apollo 15 Preliminary Science Report, 16-1?16-6, NASA SP-284.
2. Arnold, J. R.: 1972b, private communication.
3. Dalrymple, G. B. and Lanphere, M. A.: 1971,Earth Planetary Sci. Letters 12, 300.
4. Eberhardt, P., Eugster, O., Geiss, J., Grögler, N., Schwarzmüller, J., Stettler, A., and Weber, L.: 1972a, ?When was the Apollo 12 KREEP Ejected??. Revised abstracts of papers presented at the Third Lunar Sci. Conf., Houston, pp. 206-208.
5. Eberhardt, P., Geiss, J., Graf, H., Grögler, N., Krähenbühl, U., Schwaller, H., and Stettler, A.: 1972b, ?Noble Gas Investigations of Lunar Rocks 10017 and 10071?, submitted toGeochim. Cosmochim. Acta.