• Ferruccio Busoni to Robert Freund (Mailand, 13 May 1913)
    build D0100552
  • Robert Freund to Ferruccio Busoni (Kleinlaufenburg, 17 September 1899)
    build D0100509
  • Ludwig Rubiner to Ferruccio Busoni (Muralto, 13 May 1918)
    build D0100326
  • Natalie Curtis to Ferruccio Busoni ([Philadelphia], 20 February 1915)
    warning D0101915
  • Ferruccio Busoni to Robert Freund (Berlin, 8 November 1910)
    done D0100542
  • Robert Freund to Ferruccio Busoni (Budapest, 19 February 1917)
    build D0100554
  • Robert Freund to Ferruccio Busoni (Kleinlaufenburg, 20 May 1910)
    done D0100539
  • Ferruccio Busoni to Robert Freund (Berlin, 10 November 1906)
    warning D0100521
  • Robert Freund to Ferruccio Busoni (Zurich, 15 May 1912)
    build D0100549
  • Robert Freund to Ferruccio Busoni (prob. Zurich, 29 January 1912)
    warning D0100543

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