• Ferruccio Busoni to Hans Huber (Zurich, 4 September 1916)
    build D0100191
  • Ferruccio Busoni to Philipp Jarnach (Paris, 23–25 March 1920)
    done D0101686
  • Ferruccio Busoni to Hans Huber (26 May 1919, prob. Zurich)
    warning D0100219
  • Ferruccio Busoni to Heinrich Schenker (Berlin, 29 June 1897)
    done D0100057
  • Ferruccio Busoni to Jella Oppenheimer (Berlin, 29 March 1924)
    build D0102120
  • Jella Oppenheimer to Ferruccio Busoni (Florenz, 8 October 1913)
    remove_circle D0102125
  • Hans Huber to Ferruccio Busoni (Locarno, 15 April 1916)
    build D0100232
  • Ferruccio Busoni to Jella Oppenheimer (Zürich, 7 April 1916)
    done D0102106
  • Ferruccio Busoni to Jella Oppenheimer (Berlin, 19 December 1921)
    warning D0102114
  • Ferruccio Busoni to Hans Huber (Zurich, 10 December 1915)
    done D0100113

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