• Natalie Curtis to Ferruccio Busoni (New York, 2 July 1915)
    warning D0101917
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 11 July 1915)
    done D0101502
  • Natalie Curtis to Ferruccio Busoni (Far Rockaway/N.Y., 19 July 1915)
    warning D0101919
  • Ferruccio Busoni to Hugo Leichtentritt (New York, 15 August 1915)
    done D0101503
  • Natalie Curtis to Ferruccio Busoni (Far Rockaway/N.Y., 16 August 1915)
    warning D0101922
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 18 (13?) September 1915)
    remove_circle D0101560
  • Ferruccio Busoni to Jella Oppenheimer (Lausanne, 27 September 1915)
    build D0102103
  • Natalie Curtis to Ferruccio Busoni (Far Rockaway/N.Y.,)
    warning D0101918
  • Ferruccio Busoni to Jella Oppenheimer (Zürich, 8 October 1915)
    build D0102104
  • Ferruccio Busoni to Hans Huber (Zurich, 15 October 1915)
    done D0100107

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