• Hans Huber to Ferruccio Busoni (Basel, 5 February 1916)
    build D0100187
  • Hans Huber to Ferruccio Busoni (Locarno, 21 April 1916)
    build D0100225
  • Ferruccio Busoni to Hans Huber (14 April 1917, prob. Zurich)
    done D0100154
  • Hans Huber to Ferruccio Busoni (Locarno, 13 April 1917)
    done D0100153
  • Hans Huber to Ferruccio Busoni (prob. Basel, prob. 14 January 1917)
    done D0100140
  • Ferruccio Busoni to Hans Huber (Zurich, 28 October 1916)
    build D0100133
  • Ferruccio Busoni to Hans Huber (Berlin, 12 October 1910)
    done D0100105
  • Hans Huber to Ferruccio Busoni (prob. Basel, 16 February 1916)
    done D0100120
  • Ferruccio Busoni to Hans Huber (31 August 1918, prob. Zurich)
    warning D0100213
  • Hans Huber to Ferruccio Busoni (Basel, between 16 and 19 February 1917)
    done D0100148

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