Age determinations and geological studies: part 1 - isotopic ages , report 5 / R.K. Wanless..[et al] - Ottawa : Dept. of Energy, Mines and Resources, 1965. - iv, 126 p. ; 25 cm. - Geological survey of Canada .paper ; 64-17(part 1) . Subjects--Topical Terms: Potassium-argon dating. Geology -- Canada. Gov. Doc. Class. No.: G. CAN E61 (08) 2/64-17