Addressees: American Publishing Co
- SLC to American Publishing Co., 6 December 1871 · Syracuse, N.Y · UCCL12772
- Samuel L. Clemens to the American Publishing Company, 1 August 1876 · Elmira, N.Y · UCCL01352
- SLC to the American Publishing Co. · 17 April 1877 · Hartford, Conn · UCCL09794
- Samuel L. Clemens to the American Publishing Company, 12 May 1877 · Hartford, Conn · UCCL01429
- SLC to American Publishing Co., 23 March 1881 · Hartford, Conn · UCCL01930
- SLC to American Publishing Co., 17 May 1883 · Hartford, Conn · UCCL02387
- SLC to American Publishing Co., 11 August 1884 · Elmira, N.Y · UCCL01520
- OLC to American Publishing Co., 1 July 1895 · Elmira, N.Y · UCCL04919
- SLC to American Publishing Co., 24 March 1897 · London, England · UCCL05189
- SLC to American Publishing Co., 28 April 1903 · Riverdale, N.Y · UCCL06635
- SLC to American Publishing Co., 10 June 1903 · Riverdale, N.Y · UCCL10877
- SLC, OLC to American Publishing Co., 23 October 1903 · New York, N.Y · UCCL06754
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