• Hans Huber to Ferruccio Busoni (prob. Basel, c. 25 March 1916)
    done D0100123
  • Ferruccio Busoni to Jella Oppenheimer ([Berlin], 5 March 1924)
    build D0102119
  • Hans Huber to Ferruccio Busoni (Vitznau, 8 September 1916)
    build D0100234
  • Jella Oppenheimer to Ferruccio Busoni (Wien, 1 April 1916)
    remove_circle D0102131
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 9 January 1916)
    done D0101506
  • Ferruccio Busoni to Frieda Kwast-Hodapp ([Zürich], 26 May 1920)
    build D0102207
  • Hans Huber to Ferruccio Busoni (Locarno, 13 February 1918)
    warning D0100244
  • Hans Huber to Ferruccio Busoni (Locarno, prob. 16 January 1918)
    done D0100177
  • Ferruccio Busoni to Hans Huber (Zurich, 2 April 1917)
    done D0100152
  • Hans Huber to Ferruccio Busoni (Locarno, 27 December 1917)
    done D0100172

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