• Ferruccio Busoni to Arnold Schönberg (Berlin, 26 August 1909)
    done D0100015
  • Arnold Schönberg to Ferruccio Busoni (Steinakirchen am Forst, 27 August 1909)
    build D0100016
  • Ferruccio Busoni to Arnold Schönberg (Berlin, 29 August 1909)
    done D0100017
  • Jella Oppenheimer to Ferruccio Busoni (Aussee, 1 September 1909)
    remove_circle D0102149
  • Arnold Schönberg to Ferruccio Busoni (Vienna, 6 October 1909)
    done D0100018
  • Ferruccio Busoni to Arnold Schönberg (Berlin, 7 October 1909)
    build D0100019
  • Robert Freund to Ferruccio Busoni (Zurich, 8 October 1909)
    warning D0100538
  • Jella Oppenheimer to Ferruccio Busoni (Wien, 15 December 1909)
    build D0102150
  • Hans Huber to Ferruccio Busoni (Engelberg, late December 1909)
    build D0100224
  • Ludwig Rubiner to Ferruccio Busoni (Berlin, 15 January 1910)
    build D0100301

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