• Hans Huber to Ferruccio Busoni (Basel, 17 October 1915)
    build D0100228
  • Ferruccio Busoni to Hugo Leichtentritt (Paris, 13 November 1923)
    remove_circle D0101534
  • Ferruccio Busoni to Philipp Jarnach (12 May 1917)
    warning D0101620
  • Ferruccio Busoni to Philipp Jarnach (13 October 1917)
    warning D0101634
  • Ferruccio Busoni to Hans Huber (Basel, 20 January 1916)
    done D0100117
  • Hans Huber to Ferruccio Busoni (Locarno, 12 April 1916)
    build D0100231
  • Jella Oppenheimer to Ferruccio Busoni (Wien, 2 January 1914)
    remove_circle D0102126
  • Ferruccio Busoni to Hans Huber (18 July 1917, prob. Zurich)
    warning D0100207
  • Ferruccio Busoni to Arnold Schönberg (Berlin, 7 October 1909)
    build D0100019
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 5 May 1919)
    remove_circle D0101561

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