• Ferruccio Busoni to Robert Freund (Zurich, 29 November 1916)
    build D0100558
  • Robert Freund to Ferruccio Busoni (Kleinlaufenburg, 12 October 1901)
    build D0100514
  • Ludwig Rubiner to Ferruccio Busoni (Zurich, Christmas 1916, Copy)
    warning D0100306
  • Ludwig Rubiner to Ferruccio Busoni (Paris, 15 January 1913)
    build D0100303
  • Ferruccio Busoni to Robert Freund (presumably Berlin, presumably 3 February 1903)
    build D0100577
  • Kurt Weill to Ferruccio Busoni (Dresden, prob. late 1923)
    warning D0101806
  • Augusta Lawler Curtis to Ferruccio Busoni (1917)
    build D0101923
  • Natalie Curtis to Ferruccio Busoni (Far Rockaway/N.Y., 19 July 1915)
    warning D0101919
  • Ludwig Rubiner to Ferruccio Busoni (28 April 1917)
    build D0100307
  • Ludwig Rubiner to Ferruccio Busoni (Beriln, 20 November 1919)
    warning D0100340

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