• Rita Bötticher to Hugo Leichtentritt (Zurich, 11 April 1916)
    remove_circle D0101550
  • Hans Huber to Ferruccio Busoni (Locarno, 12 April 1916)
    build D0100231
  • Ferruccio Busoni to Hans Huber (Zurich, 14 April 1916)
    done D0100125
  • Hans Huber to Ferruccio Busoni (Locarno, 15 April 1916)
    build D0100232
  • Hans Huber to Ferruccio Busoni (Locarno, 21 April 1916)
    build D0100225
  • Ferruccio Busoni to Hans Huber (Zurich, 27 April 1916)
    done D0100126
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 1 May 1916)
    done D0101538
  • Ferruccio Busoni to Hans Huber (Zurich, 2 May 1916)
    done D0100127
  • Hans Huber to Ferruccio Busoni (3 May 1916, Basel)
    build D0100128
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 16 May 1916)
    done D0101510

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