Addressees: Langdon, Charles J
- Samuel L. Clemens to Charles J. Langdon, 21 August 1868 · En route from New York to Elmira, N.Y · UCCL02746
- Samuel L. Clemens to Olivia L. Langdon and Charles J. Langdon, 9 and 10 December 1868 · New York, N.Y · UCCL02727
- Samuel L. Clemens to Olivia L. Langdon and Charles J. Langdon, 12 December 1868 · Norwich, N.Y · UCCL00205
- Samuel L. Clemens to Olivia L. Langdon and Charles J. Langdon, 23 and 24 December 1868 · Lansing, Mich · UCCL00208
- Samuel L. Clemens to Olivia L. Langdon with a note to Charles J. Langdon, 12 January 1869 · El Paso, Ill · UCCL00227
- Samuel L. Clemens to Charles J. Langdon, 12 January 1869 · Ottawa, Ill · UCCL00230
- Samuel L. Clemens to Olivia L. Langdon with a note to Charles J. Langdon, 17 January 1869 · Chicago, Ill · UCCL00234
- Samuel L. Clemens to Olivia L. Langdon with a note to Charles J. Langdon, 6 March 1869 · Hartford, Conn · UCCL00269
- Samuel L. Clemens to Olivia L. Langdon with a note to Charles J. Langdon, 6 March 1869 · Hartford, Conn · UCCL00268
- Samuel L. Clemens to Olivia L. Langdon, with a note to Charles J. Langdon, 8 March 1869 · Hartford, Conn · UCCL00271
- Samuel L. Clemens to Olivia L. Langdon with a note to Jervis and Olivia Lewis Langdon, 24 May 1869 · South Windsor, Conn · UCCL00309
- Samuel L. Clemens to Charles J. Langdon, 14 November 1870 · Buffalo, N.Y · UCCL00535
- Samuel L. Clemens to Charles J. Langdon, 20 November 1870 · Buffalo, N.Y · UCCL00541
- Olivia L. and Samuel L. Clemens to Charles J. Langdon, 28? November 1874 · Hartford, Conn · UCCL01156
- Samuel L. Clemens to Charles J. Langdon, 27 January 1875 · Hartford, Conn · UCCL01186
- Samuel L. Clemens to Charles J. Langdon, 19 March 1875 · Hartford, Conn · UCCL01211
- Samuel L. Clemens to Charles J. Langdon per Fanny C. Hesse, 1 November 1876 · Hartford, Conn · UCCL01385
- Samuel L. Clemens to Charles J. Langdon, 17 June 1879 · Paris, France · UCCL01673
- Samuel L. Clemens to Charles J. Langdon, with an enclosed inscription for E. S. Bowen, 20 May 1880 · Hartford, Conn · UCCL11964
- SLC to Charles J. Langdon, 15 January 1883 · Hartford, Conn · UCCL02260
- SLC, OLC to Charles J. Langdon, 24 April 1883 · Hartford, Conn · UCCL02375
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