Letter, 3 July 1909
Letter, 10 July 1909
letter, 25 August 1971
Letter, 25 November 1971
Letter, 9 December 1971
Letter, 26 December 1971
Letter, 16 February 1972
Letter, 6 March 1972
Letter, 6 March 1972
Letter, 24 January 1973
Letter, 21 March 1973