Addressees: Langdon, Olivia Lewis
- Samuel L. Clemens to Olivia Lewis (Mrs. Jervis) Langdon, 13 February 1869 · Ravenna, Ohio · UCCL00249 CU-MARK
- Samuel L. Clemens to Olivia L. Langdon with a note to Jervis and Olivia Lewis Langdon, 24 May 1869 · South Windsor, Conn · UCCL00309 CU-MARK
- Samuel L. Clemens to Olivia Lewis (Mrs. Jervis) Langdon, 23 June 1869 · New York, N.Y · UCCL00319 NPV
- Samuel L. and Olivia L. Clemens to Jervis and Olivia Lewis Langdon, 9 February 1870 · Buffalo, N.Y · UCCL00423 CtHMTH
- Samuel L. and Olivia L. Clemens to Olivia Lewis Langdon, 20 February 1870 · Buffalo, N.Y · UCCL00430 CtHMTH
- Samuel L. and Olivia L. Clemens to Jervis and Olivia Lewis Langdon, 27 March 1870 · Buffalo, N. Y · UCCL00450 CtHMTH
- Samuel L. and Olivia L. Clemens to Jervis and Olivia Lewis Langdon, 1 April 1870 · Buffalo, N. Y · UCCL00452 CU-MARK
- Samuel L. and Olivia L. Clemens to Jervis and Olivia Lewis Langdon, 16 and 17 April 1870 · Buffalo, N.Y · UCCL00455 CtHMTH
- Samuel L. and Olivia L. Clemens to Jervis and Olivia Lewis Langdon, 19 June 1870 · Buffalo, N.Y · UCCL00480 CU-MARK
- Samuel L. Clemens to Olivia Lewis Langdon, per Telegraph Operator, 7 November 1870 · Buffalo, N.Y · UCCL00526 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 11? November 1870 · Buffalo, N.Y · UCCL08958 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 19 November 1870 · Buffalo, N.Y · UCCL00539 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 3 December 1872 · Hartford, Conn · UCCL00838 CtHMTH
- Olivia L. and Samuel L. Clemens to Olivia Lewis Langdon, 17 February 1873 · Hartford, Conn · UCCL00879 CtHMTH
- Olivia L. and Samuel L. Clemens to Olivia Lewis Langdon, 17 May 1873 · SS Batavia at New York, N.Y · UCCL00916 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 20 July 1873 · York, England · UCCL00955 CLjC
- Olivia L. and Samuel L. Clemens to Olivia Lewis Langdon, 2 and 6 August 1873 · Edinburgh, Scotland · UCCL00959 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 12 October 1873 · London, England · UCCL00973 CtHMTH
- Olivia L. and Samuel L. Clemens to Olivia Lewis Langdon, 24? September 1874 · Hartford, Conn · UCCL01133 CU-MARK
- Olivia L. and Samuel L. Clemens to Olivia Lewis Langdon, 14 March 1875 · Hartford, Conn · UCCL01207 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 22 December 1875 · Hartford, Conn · UCCL01288 CtHMTH
- Olivia L. and Samuel L. Clemens to Olivia Lewis Langdon, 2 and 4 February 1877 · Hartford, Conn · UCCL01405 CtHMTH, CU-MARK
- Samuel L. Clemens to Olivia Lewis Langdon, 5 December 1877 · Hartford, Conn · UCCL01509 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 25 December 1877 · Hartford, Conn · UCCL01517 CU-MARK
- Samuel L. Clemens to Olivia Lewis Langdon, 20 April 1878 · SS Holsatia en route from New York, N.Y., to Hamburg, Germany · UCCL01556 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 13 September 1878 · Geneva, Switzerland · UCCL01595 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 2 December 1878 · Munich, Germany · UCCL01611 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 26? December 1878 · Munich, Germany · UCCL01617 CtHMTH
- Olivia L. and Samuel L. Clemens to Olivia Lewis Langdon, 19 January 1879 · Munich, Germany · UCCL01621 CtHMTH, CU-MARK
- Samuel L. Clemens to Olivia Lewis Langdon, 23 February 1879 · Munich, Germany · UCCL01635 CtHMTH
- Samuel L. Clemens, Olivia Susan (Susy) Clemens (per Samuel L. Clemens), and Olivia L. Clemens to Olivia Lewis Langdon, 30 March 1879 · Paris, France · UCCL01645 CtHMTH
- Samuel L. Clemens to Olivia Lewis Langdon, 25 December 1880 · Hartford, Conn · UCCL01881 CU-MARK
- SLC to Susan L. Crane and Mrs. Jervis Langdon, Unknown date, Hartford, Conn · UCCL08711 CU-MARK
- SLC to Olivia Lewis Langdon, 9 January 1881 · Hartford, Conn · UCCL01889 CU-MARK
- SLC to Olivia Lewis Langdon, 19 August 1883 · Elmira, N.Y · UCCL02824 CtHMTH
- SLC to Olivia Lewis Langdon, Unknown date, Hartford, Conn · UCCL08732 CU-MARK
- SLC to Olivia Lewis Langdon, 19 October 1886 · Hartford, Conn · UCCL03471 CtHMTH
- SLC to Olivia Lewis Langdon, 21 October 1886 · Hartford, Conn · UCCL03474 CtHMTH
- SLC to Olivia Lewis Langdon, 19 April 1888 · Hartford, Conn · UCCL03716 CtHMTH
- SLC, OLC to Olivia Lewis Langdon, 19 August 1888 · Elmira, N.Y · UCCL03751 CtHMTH
- SLC to Olivia Lewis Langdon, 1 December 1888 · Hartford, Conn · UCCL03797 CU-MARK
- SLC to Olivia Lewis Langdon, 6 December 1888 · Hartford, Conn · UCCL03802 CtHMTH
- SLC, OLC to Olivia Lewis Langdon, 14–19 December 1888 · Hartford, Conn · UCCL03804 CtHMTH
- SLC to Olivia Lewis Langdon, 17 April 1889 · Hartford, Conn · UCCL03885 CtHMTH
- SLC to Olivia Lewis Langdon, 7 October 1889 · Hartford, Conn · UCCL03947 CtHMTH
- SLC to Olivia Lewis Langdon, 9 November 1889 · Hartford, Conn · UCCL03963 CtHMTH
- SLC to Olivia Lewis Langdon, 18 December 1889 · Hartford, Conn · UCCL03988 CtHMTH
- SLC to Olivia Lewis Langdon, 22 December 1889 · Hartford, Conn · UCCL03992 CtHMTH
- SLC, OLC to Olivia Lewis Langdon, 27 December 1889 · Hartford, Conn · UCCL03994 CtHMTH
- SLC, OLC to Olivia Lewis Langdon, 19 August 1890 · Elmira, N.Y · UCCL04082 CtHMTH
- SLC, OLC to Olivia Lewis Langdon, 25 December n.y. · Unknown place · UCCL10588 CtHMTH
- SLC to Olivia Lewis Langdon, Unknown date, Hartford, Conn · UCCL03820
- SLC to Olivia Lewis Langdon, Unknown date · Unknown place · UCCL07442 CtHMTH
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