• Robert Freund to Ferruccio Busoni (Zurich, 18 November 1904)
    build D0100523
  • Robert Freund to Ferruccio Busoni (presumably Zurich, 24 November 1904)
    build D0100518
  • Jella Oppenheimer to Ferruccio Busoni (o. O., [Wien], 22 January 1905)
    build D0102143
  • Ferruccio Busoni to Jella Oppenheimer (Berlin, 5 July 1905)
    build D0102101
  • Jella Oppenheimer to Ferruccio Busoni (Bad Gastein, 18 July 1905)
    build D0102144
  • Robert Freund to Ferruccio Busoni (Zurich, 3 November 1906)
    warning D0100519
  • Robert Freund to Ferruccio Busoni (8 November 1906)
    warning D0100520
  • Ferruccio Busoni to Robert Freund (Berlin, 10 November 1906)
    warning D0100521
  • Robert Freund to Ferruccio Busoni (Zurich, 17 December 1906)
    build D0100524
  • Robert Freund to Ferruccio Busoni (Zurich, 20 December 1906)
    build D0100525

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