• Ferruccio Busoni to Robert Freund (Berlin, 7 January 1907)
    build D0100526
  • Robert Freund to Ferruccio Busoni (Zurich, 23 April 1907)
    build D0100527
  • Ferruccio Busoni to Robert Freund (Zurich, 25 April 1907)
    build D0100528
  • Hans Huber to Ferruccio Busoni (Basel, before 5 June 1907)
    build D0100223
  • Ferruccio Busoni to Hans Huber (6 June 1907, prob. Berlin)
    build D0100189
  • Jella Oppenheimer to Ferruccio Busoni ([Vienna], prob. 1907)
    build D0102137
  • Jella Oppenheimer to Ferruccio Busoni (Vienna, 26 February 1908)
    warning D0102142
  • Robert Freund to Ferruccio Busoni (Zurich, 21 April 1908)
    done D0100531
  • Robert Freund to Ferruccio Busoni (Zurich, 3 May 1908)
    warning D0100537
  • Ferruccio Busoni to Robert Freund (Wien, 7 May 1908)
    done D0100532

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