• Frieda Kwast-Hodapp to Ferruccio Busoni (Berlin, 30 May 1922)
    build D0102221
  • Frieda Kwast-Hodapp to Ferruccio Busoni ([Berlin], 23 April 1922)
    build D0102220
  • Ferruccio Busoni to Hans Huber (26 December 1917)
    done D0100171
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 5 January 1919)
    remove_circle D0101527
  • Max Reger to Ferruccio Busoni (Wiesbaden, 16 February 1898)
    build D0102183
  • Ferruccio Busoni to Hugo Leichtentritt (Milan, 21 April 1913)
    remove_circle D0101545
  • Ferruccio Busoni to Hans Huber (Zurich, 8 April 1916)
    done D0100124
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 1 January 1916)
    done D0101505
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 16 May 1916)
    done D0101510
  • Hans Huber to Ferruccio Busoni (Vitznau, 5 September 1916)
    done D0100129

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