• Hans Huber to Ferruccio Busoni (5 November 1917)
    done D0100166
  • Hans Huber to Ferruccio Busoni (Vitznau, 26 October 1918)
    warning D0100249
  • Hans Huber to Ferruccio Busoni (Basel, 29 November 1916)
    done D0100137
  • Hans Huber to Ferruccio Busoni (Basel, 23 October 1915)
    build D0100229
  • Hans Huber to Ferruccio Busoni (Basel, prob. 5 November 1915)
    done D0100111
  • Ferruccio Busoni to Hans Huber (15 February 1917, prob. Zurich)
    warning D0100205
  • Hans Huber to Ferruccio Busoni (Engelberg, late December 1909)
    build D0100224
  • Hans Huber to Ferruccio Busoni (Vitznau, 16 July 1917)
    warning D0100243
  • Ferruccio Busoni to Jella Oppenheimer (Lausanne, 27 September 1915)
    done D0102103
  • Ferruccio Busoni to Hans Huber (Zurich, 12 November 1917)
    done D0100169

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