• Hugo Leichtentritt to Ferruccio Busoni (Berlin, 28 September 1916)
    done D0101515
  • Ferruccio Busoni to Hans Huber (Zurich, 31 October 1915)
    warning D0100110
  • Ferruccio Busoni to Hugo Leichtentritt (New York, 21 April 1915)
    done D0101536
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 31 August 1916)
    done D0101540
  • Ferruccio Busoni to Hugo Leichtentritt (Berlin, 1 April 1914)
    remove_circle D0101548
  • Ferruccio Busoni to Arnold Schönberg (Berlin, 27 July 1912)
    warning D0100031
  • Arnold Schönberg to Ferruccio Busoni (Berlin, 9 July 1912)
    build D0100030
  • Arnold Schönberg to Ferruccio Busoni (Berlin, 22 January 1912)
    build D0100029
  • Ferruccio Busoni to Philipp Jarnach (12 December 1917)
    warning D0101640
  • Ferruccio Busoni to Hans Huber (Zurich, 14 February 1916)
    done D0100119

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