author: walden p pratt

Mineral-resource Appraisal of the Rolla 10 X 20 Quadrangle, Missouri, as of September 1980: A Nontechnical Summary

... 40k decay constants : -0.581x10-10 yr - 1 ; 1-4.963x10-10 yr - 1 ; abundance ratio : 40K / K = 1.167x10-4 atom ... map. intrusive rocks within the map area but a short dis- tance to the south is intruded and altered by them ( J. M. Hoare ...

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