Armstrong, R. L. “Fourth International Geochronology, Cosmochronology and Isotope Geology Conference: August 21-25, 1978 Snowmass — at Aspen Colorado”. Geoscience Canada 6, no. 2 (June 6, 1979). Accessed December 26, 2024. https://journals.lib.unb.ca/index.php/GC/article/view/3158.