• Ferruccio Busoni to Robert Freund (Brussels, 26 October 1900)
    build D0100574
  • Robert Freund to Ferruccio Busoni (Kleinlaufenburg, 29 October 1900)
    build D0100512
  • Ferruccio Busoni to Robert Freund (Berlin, 19 January 1901)
    build D0100575
  • Martin Wegelius to Ferruccio Busoni (Helsingfors, 21–24 February 1901)
    warning D0102048
  • Martin Wegelius to Ferruccio Busoni (prob. Helsingfors, 2 March 1901)
    warning D0102049
  • Martin Wegelius to Ferruccio Busoni (Helsingfors, 26 May 1901)
    warning D0102050
  • Martin Wegelius to Ferruccio Busoni (Bologna, 22 June 1901)
    warning D0102051
  • Robert Freund to Ferruccio Busoni (Kleinlaufenburg, 12 October 1901)
    build D0100514
  • Martin Wegelius to Ferruccio Busoni (Helsingfors, 13 October 1901)
    warning D0102052
  • Martin Wegelius to Ferruccio Busoni (Helsingfors, 10 November 1901)
    warning D0102054

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