• Ferruccio Busoni to Hugo Leichtentritt (Zurich, 12/13 February 1916)
    done D0101537
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 6 August 1916)
    done D0101513
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 1 May 1916)
    done D0101538
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 7 February 1916)
    done D0101508
  • Jella Oppenheimer to Ferruccio Busoni ([Wien], 1908)
    remove_circle D0102139
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 25 May 1920)
    remove_circle D0101529
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 26 March 1915)
    done D0101501
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 5 September 1912)
    done D0101517
  • Arnold Schönberg to Ferruccio Busoni (Vienna, 3 July 1910)
    done D0100020
  • Arnold Schönberg to Ferruccio Busoni (Zehlendorf, 24 October 1911)
    done D0100027

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