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
- OLC to Olivia Lewis Langdon and Charles J. Langdon, July 1873 · London, England · UCCL00938
- OLC to Charles J. Langdon, 20 September 1873 · London, England · UCCL00802
- 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
- OLC to Charles J. Langdon, 21 July 1878 · Heidelberg, Germany · UCCL01578
- OLC to Charles J. Langdon, 9 March 1879 · Paris, France · UCCL01638
- OLC to Charles J. Langdon, June 1879 · Unknown place · UCCL01618
- 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
- SLC to Charles J. Langdon, 17 May 1885 · Hartford, Conn · UCCL10699
- OLC per SLC to Charles J. Langdon, 25 July 1887 · Elmira, N.Y · UCCL03614
- SLC to Charles J. Langdon, 31 January 1888 · Hartford, Conn · UCCL03699
- SLC to Charles J. Langdon, 13 May 1891 · Hartford, Conn · UCCL11728
- SLC to Charles J. Langdon, 7 August 1892 · Bad Nauheim, Germany · UCCL01660
- SLC to Charles J. Langdon, 18 July 1893 · Krankenheil, Germany · UCCL12381
- SLC to Charles J. Langdon, 13 September 1896 · London, England · UCCL05109
- OLC to Charles J. Langdon, 24 April 1898 · Vienna, Austria · UCCL05378
- SLC to Charles J. Langdon, 5 August 1898 · Kaltenleutgeben, Austria · UCCL11311
- SLC to Charles J. Langdon, 11 September 1902 · York Harbor, Me · UCCL06431
- SLC to Charles J. Langdon, 26 December 1902 · Riverdale, N.Y · UCCL06531
- SLC to Charles J. Langdon, 14 February 1904 · Florence, Italy · UCCL06794
- SLC to Charles J. Langdon, 27 May 1904 · Florence, Italy · UCCL06840
- SLC to Charles J. Langdon, 6 June 1904 · Florence, Italy · UCCL06860
- SLC to Charles J. Langdon, 8 June 1904 · Florence, Italy · UCCL06865
- SLC to Charles J. Langdon, 8 June 1904 · Florence, Italy · UCCL06864
- SLC to Charles J. Langdon, 13 June 1904 · Florence, Italy · UCCL06869
- SLC to Charles J. Langdon, 19 June 1904 · Florence, Italy · UCCL06875
- SLC to Charles J. Langdon, 26 June 1904 · Rome, Italy · UCCL06881
- SLC to Charles J. Langdon, 25 July 1904 · Lee, Mass · UCCL06901
- SLC to Charles J. Langdon, 13 October 1904 · New York, N.Y · UCCL06929
- SLC to Charles J. Langdon, 15 October 1904 · New York, New York · UCCL13025
- SLC to Charles J. Langdon, 4 April 1906 · New York, N.Y · UCCL07412
- SLC per Isabel V. Lyon to Charles J. Langdon, 25 May 1906 · Dublin, N.H · UCCL10675
- SLC to Charles J. Langdon, 11 February 1908 · New York, N.Y · UCCL07934
- SLC to Charles J. Langdon, 12 December 1908 · Redding, Conn · UCCL08180
- Isabel V. Lyon per Mary L. Howden to Charles J. Langdon, 18 January 1909 · Redding, Conn · UCCL08331
- SLC per Albert Bigelow Paine to Charles J. Langdon family, 26 December–7 January 1910 · Redding, Conn · UCCL08521
- SLC to Charles J. Langdon, Unknown date · Unknown place · UCCL09241
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