• Ferruccio Busoni to Robert Freund (Berlin, 19 August 1897)
    warning D0100566
  • Robert Freund to Ferruccio Busoni (Zurich, 8 October 1909)
    warning D0100538
  • Ludwig Rubiner to Ferruccio Busoni (Muralto, 27–29 March 1918)
    build D0100319
  • Robert Freund to Ferruccio Busoni (Zurich, 23 June 1908)
    build D0100529
  • Martin Wegelius to Ferruccio Busoni (Helsingfors, 15 May 1900)
    warning D0102047
  • Natalie Curtis to Ferruccio Busoni (Far Rockaway/N.Y.,)
    warning D0101918
  • Natalie Curtis to Ferruccio Busoni (Philadelphia, 19 February 1915)
    done D0101914
  • Philipp Jarnach to Ferruccio Busoni (Berlin, 16 January 1924)
    done D0101729
  • Ferruccio Busoni to Philipp Jarnach ([Zurich], 4 March 1918)
    done D0101653
  • Robert Freund to Ferruccio Busoni (13 November 1906)
    warning D0100522

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