• Ferruccio Busoni to Hans Huber (Zurich, 10 February 1916)
    build D0100188
  • Hans Huber to Ferruccio Busoni (Basel, 11 February 1916)
    build D0100135
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 12/13 February 1916)
    done D0101537
  • Ferruccio Busoni to Hans Huber (Zurich, 14 February 1916)
    done D0100119
  • Hans Huber to Ferruccio Busoni (prob. Basel, 16 February 1916)
    done D0100120
  • Ferruccio Busoni to Hans Huber (Zurich, 17 February 1916)
    done D0100121
  • Hans Huber to Ferruccio Busoni (12 or 13 March 1916, prob. Basel)
    done D0100122
  • Hans Huber to Ferruccio Busoni (prob. Basel, c. 25 March 1916)
    done D0100123
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 29 March 1916)
    done D0101509
  • Rita Bötticher to Hugo Leichtentritt (Zurich, 31 March 1916)
    remove_circle D0101549

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