Letter, 23 December 1875
Letter, 5 March 1880
Copy of letter, 23 February 1881
Copy of letter, 20 February 1882
Copy of letter, 15 April 1882
Copy of letter, 21 April 1882
Copy of letter, 2 April 1884
Copy of letter, 29 October 1884
Copy of letter, 21 March 1884
Copy of letter, 18 April 1884