Addressees: Langdon, Jervis
- Samuel L. Clemens to Jervis Langdon, 2 December 1868 · New York, N.Y · UCCL02772 CtHMTH
- Samuel L. Clemens to Jervis Langdon, 29 December 1868 · Cleveland, Ohio · UCCL00212 Mo4, CLjC
- 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. and Olivia L. Clemens to Jervis and Olivia Lewis Langdon, 9 February 1870 · Buffalo, N.Y · UCCL00423 CtHMTH
- Olivia L. and Samuel L. Clemens to Jervis Langdon, 26 February 1870 · Buffalo, N.Y · UCCL00433 CtHMTH
- Samuel L. and Olivia L. Clemens to Jervis Langdon, 2 and 3 March 1870 · Buffalo, N.Y · UCCL00437 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
- Olivia L. and Samuel L. Clemens to Jervis Langdon, 13 May 1870 · Buffalo, N.Y · UCCL00464 CtHMTH
- Samuel L. Clemens to Jervis Langdon, 22 May 1870 · Buffalo, N.Y · UCCL00469 CtHMTH
- Samuel L. and Olivia L. Clemens to Jervis and Olivia Lewis Langdon, 19 June 1870 · Buffalo, N.Y · UCCL00480 CU-MARK
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