Sources: NHi
- Samuel L. Clemens to James Redpath and George L. Fall, 10 June 1871 · Elmira, N.Y · UCCL00614
- Samuel L. Clemens to James Redpath, 17 December 1873 · London, England · UCCL01009
- SLC to Lorenz Reich, 2 December 1882 · Hartford, Conn · UCCL09103
- SLC to Karl Gerhardt, 4 June 1885 · Hartford, Conn · UCCL03236
- SLC to St. Andrew’s Society, November 1901 · Riverdale, N.Y · UCCL09105
- SLC per Olivia L. Clemens to George A. Morrison, 28 November 1901 · Riverdale, N.Y · UCCL09106
- SLC to Titus M. Coan, 21 June 1904 · Florence, Italy · UCCL09104
- SLC to Emma C. Thursby, 6 December 1905 · New York, New York · UCCL13035
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