• Hans Huber to Ferruccio Busoni (Basel, 13 December 1915)
    done D0100115
  • Ferruccio Busoni to Hans Huber (Zurich, 7 December 1916)
    warning D0100201
  • Hans Huber to Ferruccio Busoni (Vitznau, 5 June 1918)
    warning D0100246
  • Hans Huber to Ferruccio Busoni (Locarno, 10 April 1919)
    done D0100182
  • Ferruccio Busoni to Hans Huber (prob. Zurich, 29 December 1917)
    done D0100173
  • Hans Huber to Ferruccio Busoni (Basel, 8 October 1916)
    build D0100236
  • Ferruccio Busoni to Hans Huber (Zurich, 11 December 1915)
    done D0100114
  • Ferruccio Busoni to Hans Huber (prob. Zurich, 26 May 1917)
    build D0100159
  • Hans Huber to Ferruccio Busoni (Basel, between 21 and 30 April 1917)
    done D0100156
  • Ferruccio Busoni to Hans Huber (Zurich, 27 April 1916)
    done D0100126

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