1. Mass Spectrometric Determination of the Relative Isotopio Abundances of Calcium and the Determination of Geologic Age;Backus,1955
2. Herzog L. F. (1951) Unpublished report.
3. Variations in Isotopic Abundances of Sr, Ca and A and Related Topics;Herzog;U.S.A.E.C. Document N.Y.O. 3934-II,1954
4. Variations in Isotopic Abundances of Sr, Ca and A and Related Topics;Herzog;U.S.A.E.C. Document N.Y.O.-3935-II,1955
5. Rb-Sr and K-Ca Analyses and Ages;Herzog;N.R.C. Nucl. Sci. Ser. Report 19,1956