• Natalie Curtis to Ferruccio Busoni (New York, 19 March 1911)
    warning D0101906
  • Hans Huber to Ferruccio Busoni (Locarno, 15 November 1917)
    done D0100170
  • Ferruccio Busoni to Hans Huber (Zurich, 9 February 1917)
    build D0100145
  • Jella Oppenheimer to Ferruccio Busoni (Bad Gastein, 18 July 1905)
    done D0102144
  • Ferruccio Busoni to Wilhelm Kienzl (Klagenfurt, 15 April 1879)
    warning D0102236
  • Wilhelm Kienzl to Ferruccio Busoni (Graz, 28 March 1902)
    build D0102238
  • Ferruccio Busoni to Wilhelm Kienzl (Klagenfurt, 25 April 1879)
    build D0102237
  • Heinrich Schenker to Ferruccio Busoni (Vienna, 26 June 1897)
    done D0100056
  • Jella Oppenheimer to Ferruccio Busoni (Wien, 17 September 1914)
    done D0102128
  • Ferruccio Busoni to Heinrich Schenker (not before 7 November 1899)
    done D0100064

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