• Ferruccio Busoni to Hans Huber (Zurich, 31 October 1915)
    warning D0100110
  • Hans Huber to Ferruccio Busoni (Basel, prob. 2 November 1915)
    build D0100230
  • Hans Huber to Ferruccio Busoni (Basel, prob. 5 November 1915)
    done D0100111
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 12/13 November 1915)
    done D0101504
  • Ferruccio Busoni to Jella Oppenheimer (Zürich, 19 November 1915)
    build D0102105
  • Hans Huber to Ferruccio Busoni (Solothurn, prob. 26 November 1915)
    done D0100112
  • Philipp Jarnach to Ferruccio Busoni (Zurich, 8 December 1915)
    warning D0101604
  • Ferruccio Busoni to Hans Huber (Zurich, 10 December 1915)
    done D0100113
  • Ferruccio Busoni to Hans Huber (Zurich, 11 December 1915)
    done D0100114
  • Hans Huber to Ferruccio Busoni (Basel, 13 December 1915)
    done D0100115

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