Addressees: Boyesen, Hjalmar H
- Samuel L. Clemens to Hjalmar H. Boyesen, 17 January 1877 · Hartford, Conn · UCCL12673
- Samuel L. Clemens to Hjalmar H. Boyesen, 6 November 1879 · Hartford, Conn · UCCL01707
- Samuel L. Clemens to Hjalmar H. Boyesen, 23 April 1880 · Hartford, Conn · UCCL01792
- SLC to Hjalmar H. Boyesen, 26 October 1881 · Hartford, Conn · UCCL02067
- SLC to Hjalmar H. Boyesen, 11 January 1882 · Hartford, Conn · UCCL02149
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