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