Addressees: Cox, Samuel S. (Sunset)
- Samuel L. Clemens to Samuel S. Cox, 9 March 1871 · Buffalo, N.Y · UCCL11006 CtHMTH
- Samuel L. Clemens to Samuel S. Cox, 4 February 1874 · Hartford, Conn · UCCL01046 NN5
- Samuel L. Clemens to Samuel S. Cox, 8 February 1875 · Hartford, Conn · UCCL01190 NN5, CU-MARK
- SLC to Samuel S. Cox, 9 July 1887 · Elmira, N.Y · UCCL03598 NN5
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