Letter, 19 August 1897
Letter, 10 January 1895
Letter, 2 November 1888
Letter, 7 December 1887
Letter, 1 February 1890
Letter, 1 December 1860
Letter, 1 December 1860
Letter, 3 April 1889
Letter from Otto Hahn to B.J. Harrington, written from toronto.
Letter, 2 March 1876
Letter, 11 January 1911