• Ferruccio Busoni to Frieda Kwast-Hodapp ([Berlin], 6 October 1914)
    warning D0102202
  • Frieda Kwast-Hodapp to Ferruccio Busoni (Berlin, 19 December 1921)
    warning D0102215
  • Ferruccio Busoni to Hugo Leichtentritt (New York, 15 August 1915)
    done D0101503
  • Hans Huber to Ferruccio Busoni (Locarno, 24 September 1916)
    done D0100132
  • Hans Huber to Ferruccio Busoni (Locarno, 9 November 1917)
    done D0100168
  • Ferruccio Busoni to Hans Huber (Basel, 10 June 1917)
    done D0100163
  • Ferruccio Busoni to Hans Huber (Zurich, 25 September 1916)
    build D0100194
  • Ferruccio Busoni to Hans Huber (Zurich, 20 April 1917)
    done D0100155
  • Ferruccio Busoni to Hans Huber (Zurich, 18 October 1915)
    done D0100108
  • Ferruccio Busoni to Hans Huber (Zurich, 16 January 1917)
    done D0100141

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