1. Symposium on Tektites, Geochim. et Cosmochim. Acta, 14, (1958).
2. Plunkett, J. D., Hawkins, G. S., and Wolfson, S. H. (unpublished work at O. Hommel Co., Pittsburgh, Pa.).
3. McCaig, J. B., Hawkins, G. S., and Wolfson, S. H. (unpublished work at High Vacuum Equipment Corp., Hingham Mass.).
4. Wolfson, S. H. (unpublished work).