1. A Symposium on the Use of Isotopes in Biology and Medicine, 1947 (University of Wisconsin Press, Madison, 1948)
2. Proceedings of Seminar on the Use of Stable Isotopes in Clinical Pharmacology, University of Chicago, Chicago, Illinois, 1971, P.D. Klein, L.J. Roth, (U.S. Atomic Energy Commission, Conf.-711115, 1972)
3. Proceedings of the First International Conference on Stable Isotopes in Chemistry, Biology, and Medicine, Argonne National Laboratory, Argonne, Illinois, 1973, P.D. Klein, S.V. Peterson, (U.S. Atomic Energy Commission, Conf.-730525)
4. Proceedings of Symposium on Isotope Ratios as Pollutant Source and Behaviour Indicators, Vienna, 1974 (International Atomic Energy Agency, Vienna, 1975)
5. Proceedings of the Second International Conference on Stable Isotopes, Oak Brook, Illinois, 1975, E.R. Klein, P.D. Klein, (U.S. Energy Research and Development Administration, Conf.-751027)