• Hans Huber to Ferruccio Busoni (Basel, 12 November 1911)
    build D0100227
  • Hans Huber to Ferruccio Busoni (prob. Basel, prob. 3 June 1917)
    done D0100160
  • Ferruccio Busoni to Hans Huber (Zurich, 20 February 1917)
    done D0100146
  • Heinrich Schenker to Ferruccio Busoni (Vienna, 7–8 January 1900)
    done D0100076
  • Heinrich Schenker to Ferruccio Busoni (Vienna, 9 September 1903)
    done D0100083
  • Ferruccio Busoni to Frieda Kwast-Hodapp ([Berlin], 31 May 1921)
    build D0102209
  • Hans Huber to Ferruccio Busoni (Basel, 11 February 1917)
    warning D0100242
  • Gerda Busoni to Heinrich Schenker (Berlin, 20 November 1903)
    done D0100086
  • Heinrich Schenker to Ferruccio Busoni (Vienna, 15 March 1898)
    done D0100068
  • Hans Huber to Ferruccio Busoni (Vitznau, prob. 16 September 1910)
    done D0100103

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