Addressees: Clark, Charles H
- Samuel L. Clemens to Charles H. Clark, 8 January 1876 · Hartford, Conn · UCCL12742 CU-MARK
- Samuel L. Clemens to Charles H. Clark, 19? January 1878 · Hartford, Conn · UCCL01524
- Samuel L. Clemens to Charles H. Clark, 6 March 1880 · Hartford, Conn · UCCL08597 CtHMTH
- SLC to Charles H. Clark, 3 October 1882 · Hartford, Conn · UCCL12948 CU-MARK
- SLC to Charles H. Clark, 24 June 1884 · Elmira, N.Y · UCCL02994 CtHMTH
- SLC to Charles H. Clark, 9 November 1884 · Providence, R.I · UCCL12812 CU-MARK
- SLC to Charles H. Clark, 3 January 1886 · Hartford, Conn · UCCL03352 CtHT-W
- SLC to Charles H. Clark, 13 August 1887 · Elmira, N.Y · UCCL03625 CtHT-W
- SLC to Charles H. Clark, 2 July 1888 · Elmira, N.Y · UCCL03728 CU-MARK
- SLC to Charles H. Clark, 21 October 1900 · New York, N.Y · UCCL05879
- SLC to Charles H. Clark, 24 October 1900 · New York, N.Y · UCCL12759 CU-MARK
- SLC to Charles H. Clark, 23 March 1903 · Riverdale, N.Y · UCCL06607 CU-MARK
- SLC per Isabel V. Lyon to Charles H. Clark, 26 February 1906 · New York, N.Y · UCCL07357 TxU-Hu
- SLC to Charles H. Clark, 4 March 1906 · New York, N.Y · UCCL07362 NN-BGC
- SLC per Isabel V. Lyon to Charles H. Clark, 10 March 1906 · New York, N.Y · UCCL07373 CU-MARK
- SLC per Isabel V. Lyon to Charles H. Clark, 16 March 1906 · New York, N.Y · UCCL07383 CU-MARK
- SLC per Isabel V. Lyon to Charles H. Clark, 22 January 1907 · New York, N.Y · UCCL07633 CU-MARK
- SLC per Isabel V. Lyon to Charles H. Clark, 9 December 1908 · Redding, Conn · UCCL08168 CU-MARK
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