• Ferruccio Busoni to Hans Huber (Bottmingen, 17 September 1910)
    done D0100104
  • Ferruccio Busoni to Hans Huber (Berlin, 12 October 1910)
    done D0100105
  • Hans Huber to Ferruccio Busoni (Basel, 15 October 1910)
    done D0100106
  • Paul Bekker to Ferruccio Busoni (Berlin, 23 October 1910)
    build D0100401
  • Ferruccio Busoni to Paul Bekker (Berlin, 24 October 1910)
    build D0100402
  • Robert Freund to Ferruccio Busoni (Zurich, 1 November 1910)
    done D0100541
  • Ferruccio Busoni to Robert Freund (Berlin, 8 November 1910)
    done D0100542
  • Hans Huber to Ferruccio Busoni (Basel, 1 December 1910)
    build D0100226
  • Natalie Curtis to Ferruccio Busoni (New York, 18 February 1911)
    build D0101904
  • Natalie Curtis to Ferruccio Busoni ([New York], 2 March 1911)
    warning D0101905

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