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, 29 October 1884
Copy of letter, 2 April 1884
Copy of letter, 21 March 1884
Copy of letter, 18 April 1884