[Letter: date unknown]
[Letter of 1878 April 10]
[Letter: date unknown]
[Letter: date unknown]
[Letter of 1874 September 9]
[Letter of 1868 April 16]
[Letter: date unknown]
[Letter of 1876 May 23]
[Letter of 1873 August 20]
[Letter: date unknown]
[Letter of 1869 February 5]
[Letter of 1873 August 22]