• Frieda Kwast-Hodapp to Ferruccio Busoni (Berlin, 19 October 1921)
    warning D0102214
  • Heinrich Schenker to Ferruccio Busoni (Vienna, 2 January 1899)
    done D0100073
  • Ferruccio Busoni to Hans Huber (4 June 1918, prob. Zurich)
    warning D0100212
  • Wilhelm Kienzl to Ferruccio Busoni (Graz, 10 October 1886)
    build D0102235
  • Ferruccio Busoni to Hans Huber (Zurich, 10 February 1916)
    build D0100188
  • Ferruccio Busoni to Jella Oppenheimer (Zürich, c. September to 1 October 1917)
    done D0102111
  • Ferruccio Busoni to Hans Huber (23 December 1916, prob. Zurich)
    warning D0100203
  • Jella Oppenheimer to Ferruccio Busoni (Rom, 13 March 1913)
    build D0102123
  • Ferruccio Busoni to Frieda Kwast-Hodapp ([Berlin], 4 September 1922)
    remove_circle D0102225
  • Frieda Kwast-Hodapp to Ferruccio Busoni (Berlin, 3 September 1922)
    build D0102224

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