• Ferruccio Busoni to Robert Freund (Zurich, 25 April 1907)
    build D0100528
  • Martin Wegelius to Ferruccio Busoni (Helsingfors, 9 June 1896)
    build D0102030
  • Robert Freund to Ferruccio Busoni (Budapest, 14 September 1917)
    build D0100560
  • Robert Freund to Ferruccio Busoni (Budapest, 25 October 1912)
    build D0100553
  • Ferruccio Busoni et al. to Robert Freund (Zurich, 3 September 1916)
    warning D0100580
  • Robert Freund to Ferruccio Busoni (Kleinlaufenburg, 16 September 1900)
    build D0100511
  • Ferruccio Busoni to Robert Freund (Berlin, 7 January 1907)
    build D0100526
  • Paul Bekker to Ferruccio Busoni (Berlin, 23 October 1910)
    build D0100401
  • Ferruccio Busoni to Arnold Schönberg (Berlin, 2 August 1909)
    done D0100011
  • Arnold Schönberg to Ferruccio Busoni (Steinakirchen am Forst, 27 August 1909)
    build D0100016

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