• Ferruccio Busoni to Philipp Jarnach (31 October 1918)
    warning D0101664
  • Philipp Jarnach to Ferruccio Busoni ([Zurich], 18 October 1918)
    done D0101661
  • Arnold Schönberg to Ferruccio Busoni (Payerbach, 10 September 1903)
    build D0100001
  • Ferruccio Busoni to Robert Freund (prob. Berlin, 27 August 1923)
    warning D0100565
  • Ferruccio Busoni to Robert Freund (Berlin, 22 April 1912)
    build D0100547
  • Robert Freund to Ferruccio Busoni (Zurich, 25 April 1912)
    build D0100548
  • Robert Freund to Ferruccio Busoni (Zurich, 28 June 1908)
    build D0100530
  • Ferruccio Busoni to Robert Freund (Budapest, between 1 and 17 March 1899)
    warning D0100507
  • Ferruccio Busoni to Philipp Jarnach ([Zurich], 5 August 1920)
    done D0101693
  • Robert Freund to Ferruccio Busoni (Zurich, 2 February 1912)
    warning D0100544

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