Addressees: Houghton (H. O.) & Co
- Samuel L. Clemens to H. O. Houghton and Company, 5 January 1875 · Hartford, Conn · UCCL01173 MH-H
- Samuel L. Clemens to H. O. Houghton and Company, 6 January 1875 · Hartford, Conn · UCCL01174 MH-H
- Samuel L. Clemens to H. O. Houghton and Company, 12 February 1875 · Hartford, Conn · UCCL01192 MH-H
- Samuel L. Clemens to H. O. Houghton and Company, 28 October 1875 · Hartford, Conn · UCCL01278 ViU
1