• Robert Freund to Ferruccio Busoni (Zurich, 28 February 1899)
    build D0100506
  • Ferruccio Busoni to Robert Freund (Zurich, 22 October 1916)
    build D0100557
  • Robert Freund to Ferruccio Busoni (Zurich, 22 August 1897)
    warning D0100502
  • Martin Wegelius to Ferruccio Busoni (Helsingfors, 26 May 1896)
    build D0102029
  • Robert Freund to Ferruccio Busoni (Kleinlaufenburg, 14 September 1900)
    build D0100510
  • Ferruccio and Gerda Busoni to Mr and Mrs Robert Freund (1899)
    warning D0100569
  • Ferruccio Busoni to Robert Freund (Wien, 24 June 1908)
    done D0100535
  • Robert Freund to Ferruccio Busoni (Zurich, 20 December 1906)
    build D0100525
  • Ludwig Rubiner to Ferruccio Busoni (prob. Zurich, c May 1917)
    build D0100308
  • Robert Freund to Ferruccio Busoni (Zurich, 20 April 1912)
    build D0100546

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