Letter, 7 November 1869
Letter, 20 December 1869
Letter, 10 October 1869
Letter, 21 November 1869
Pocket diaries, 1869-1872
Scientific correspondence, 1869-1889
Scientific correspondence, 1869-1889
Letters, 1869
Letters, 1869
Letter, 30 December 1870
Letter, 9 January 1870
Letter, 1 May 1870