• Ferruccio Busoni to Philipp Jarnach (12 May 1917)
    warning D0101620
  • Ferruccio Busoni to Hans Huber (Zurich, 19 May 1917)
    done D0100157
  • Hans Huber to Ferruccio Busoni (Basel, 21 May 1917)
    done D0100158
  • Ferruccio Busoni to Hans Huber (22 May 1917, prob. Zurich)
    build D0100183
  • Ferruccio Busoni to Hans Huber (prob. Zurich, 26 May 1917)
    build D0100159
  • Ludwig Rubiner to Ferruccio Busoni (Zurich, 28 May 1917)
    build D0100309
  • Ludwig Rubiner to Ferruccio Busoni (prob. Zurich, c May 1917)
    build D0100308
  • Hans Huber to Ferruccio Busoni (prob. Basel, prob. 3 June 1917)
    done D0100160
  • Ferruccio Busoni to Hans Huber (Zurich, 4 June 1917)
    done D0100161
  • Hans Huber to Ferruccio Busoni (Basel, 5 June 1917)
    done D0100162

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