Addressees: Ferguson, Henry
- Samuel L. Clemens to Henry Ferguson, 20 November 1899 . London, England · UCCL13204
- Samuel L. Clemens to Henry Ferguson, 21 December 1899 . London, England · UCCL13205
- Samuel L. Clemens to Henry Ferguson, 19 January 1900 . London, England · UCCL13206
- Samuel L. Clemens to Henry Ferguson, 4 March 1900 . London, England · UCCL13207
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