1. Abell, P. I., Eglinton, G., Maxwell, J. R., and Pillinger, C. T., Nature, 226, 251 (1970).
2. Abell, P. I., Cadogan, P. H., Eglinton, G., Maxwell, J. R., and Pillinger, C. T., Proc. Second Lunar Sci. Conf., Geochim. Cosmochim. Acta, Suppl. 2, 2 (edit. by Levinson, A. A.), 1843 (MIT Press, 1971).
3. Cadogan, P. H., Eglinton, G., Maxwell, J. R., and Pillinger, C. T., Nature, 231, 29 (1971).
4. Cadogan, P. H., Eglinton, G., Firth, J. N. M., Maxwell, J. R., Mays, B. J., and Pillinger, C. T., Proc. Third Lunar Sci. Conf., Geochim. Cosmochim. Acta, Suppl. 3, 2 (edit. by Heyman, D.), (MIT Press, 1972).
5. Holland, P. T., Simoneit, B. R., Wszolek, P. C., McFadden, W. H., and Burlingame, A. L., Nature, 235, 106 (1972).