Letter from Kathleen Yardley Lonsdale, to Alfred Charles Glyn Egerton, regarding a paper 'The refinement of atomic parameters by the technique known in X-ray crystallography as ‘the method of steepest descents’' by A D Booth Sectional Committee: Mathematics Has looked at the paper again, and finds it in order and suitable for publication. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on recto as received 19 October 1948. 19 October 1948