Sources: NN
- Samuel L. Clemens to Charles F. Wingate, 31 March 1870 · Buffalo, N. Y · UCCL00451
- Samuel L. Clemens to Edward P. Ackerman, 31 July 1871 · Elmira, N.Y · UCCL00641
- Samuel L. Clemens to Horace Greeley, 17 August 1871 · Hartford, Conn · UCCL00645
- Samuel L. Clemens to Frank Mayo, 19–22 March 1872 · Elmira, N.Y · UCCL11847
- Samuel L. Clemens to Unidentified, 19 March–8 May 1872 · Elmira, N.Y · UCCL09046
- Samuel L. Clemens to Elisha Bliss, Jr., 28 July 1872 · New Saybrook, Conn · UCCL00781
- Samuel L. Clemens to James Redpath, 24 January 1873 · Hartford, Conn · UCCL00864
- Samuel L. Clemens to the Staff of the New York Tribune, 30 January 1873 · Hartford, Conn · UCCL00870
- Samuel L. Clemens to the Staff of the New York Tribune, 7 March 1873 · Hartford, Conn · UCCL00885
- Samuel L. Clemens to to Victor Wolff, per Fanny C. Hesse, 1? January 1877 · Hartford, Conn · UCCL10739
- SLC to James R. Osgood, 7 March–14 March 1883 · Hartford, Conn · UCCL08820
- SLC to Benjamin H. Ticknor, 7–14 March 1883 · Hartford, Conn · UCCL02329
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