• Ferruccio Busoni to Hugo Leichtentritt (Zurich, 20 May 1918)
    remove_circle D0101555
  • Rita Bötticher to Hugo Leichtentritt (Zurich, 25 October 1916)
    remove_circle D0101551
  • Ferruccio Busoni to Hugo Leichtentritt (Zurich, 18 (13?) September 1915)
    remove_circle D0101560
  • Ferruccio Busoni to Arnold Schönberg (Berlin, not before 29 July 1912)
    done D0100033
  • Arnold Schönberg to Ferruccio Busoni (Steinakirchen am Forst, 24 August 1909)
    done D0100014
  • Hans Huber to Ferruccio Busoni (Locarno, 18 April 1917)
    build D0100184
  • Arnold Schönberg to Ferruccio Busoni (Zehlendorf, 11 November 1911)
    build D0100028
  • Ferruccio Busoni to Frieda Kwast-Hodapp ([Berlin], 7 June 1921)
    warning D0102211
  • Arnold Schönberg to Ferruccio Busoni (Berg am Starnberger See, 29 August 1911)
    done D0100024
  • Arnold Schönberg to Ferruccio Busoni (Berlin, 4 September 1910)
    build D0100023

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