Mason, R. Mason (later Sir Ronald Mason) was a research student from 1953. Correspondence etc re: recommendations etc, and later professional correspondence and papers. This file includes correspondence etc, 1953, between 'Katie' [Lonsdale] and 'Tiny' [H.M. Powell], of the Chemical Crystallography Laboratory, Oxford, concerning research connected to Mason's work. This correspondence was found with material in the previous 9 files. 1950-1965