1. For example: S. J. M. Allen inHandbook of Chemistry and Physics, edited by C. D. Hodgman (Chemical Rubber Publishing Company, Cleveland, 1950), thirty-second edition, p. 2181.
2. Radioisotopes:Catalog and Price List, Isotopes Branch, United States Atomic Energy Commision, P. O. Box E, Oak Ridge, Tennessee;Pile Produced Isotopes, Isotopes Branch, National Research Council, Atomic Energy Project, Chalk River, Ontario, Canada.