• Ludwig Rubiner to Ferruccio Busoni (Locarno, 17 April 1918)
    build D0100320
  • Ferruccio Busoni to Ludwig Rubiner (Genève, 21 April 1918)
    done D0100321
  • Ludwig Rubiner to Ferruccio Busoni (Locarno, 22 April 1918)
    build D0100322
  • Ludwig Rubiner to Ferruccio Busoni (Muralto, 23–24 April 1918)
    build D0100323
  • Ludwig Rubiner to Ferruccio Busoni (Muralto, 27 April 1918)
    build D0100324
  • Ludwig Rubiner to Ferruccio Busoni (Locarno, 9 May 1918)
    build D0100325
  • Ludwig Rubiner to Ferruccio Busoni (Muralto, 13 May 1918)
    build D0100326
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 20 May 1918)
    remove_circle D0101555
  • Ferruccio Busoni to Hans Huber (24 May 1918, prob. Zurich)
    warning D0100210
  • Ferruccio Busoni to Hans Huber (30 May 1918, prob. Zurich)
    warning D0100211

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