Sources: MoPeS
- Samuel L. Clemens to Francis E. Bliss, 9–12 July 1872 · New Saybrook, Conn · UCCL00767
- Samuel L. Clemens to Elisha Bliss, Jr., 18 November 1875 · Hartford, Conn · UCCL01281
- Samuel L. Clemens to Elisha Bliss, Jr., 16 May 1876 · Hartford, Conn · UCCL01335
- SLC to American Publishing Co., 23 March 1881 · Hartford, Conn · UCCL01930
1