• Natalie Curtis to Ferruccio Busoni (Philadelphia, 19 February 1915)
    build D0101914
  • Natalie Curtis to Ferruccio Busoni ([Philadelphia], 20 February 1915)
    warning D0101915
  • Ferruccio Busoni to Natalie Curtis (New York, 22 February 1915)
    warning D0101903
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 26 March 1915)
    done D0101501
  • Ferruccio Busoni to Hugo Leichtentritt (New York, 21 April 1915)
    done D0101536
  • Natalie Curtis to Ferruccio Busoni (New York, 17 June 1915)
    warning D0101916
  • 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

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