Letter from [Alan Archibald Campbell] Swinton, to John Muir [Esquire], Director, British Institute of Radiology Incorporated with the Rontgen Society Responding to a previous letter stating that Muir seems to be unaware that on 20 December 1926, he wrote a letter to the Honorary Secretary of the Rontgen Society stating that he resigned his membership of that Society, explaining his reasons for doing so. 7 July 1928