Sources: Hald2
- SLC to Hezekiah L. Bateman 1 to 25 June 1873 · London, England · UCCL13040
- Samuel L. Clemens to Frank Fuller, 18 February 1880 · Hartford, Conn · UCCL13039
- SLC to Chatto & Windus, 9 August 1893, Krankenheil-Tolz, Bavaria · UCCL13417
- SLC to Unidentified, June 1894 · Paris, France · UCCL13042
- SLC to Mrs. Annie E. Thomas, 25 December 1900 · New York, N.Y · UCCL13041
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