• Ferruccio Busoni to Hugo Leichtentritt (Zurich, 13 January 1916)
    done D0101507
  • Rita Bötticher to Hugo Leichtentritt (Zurich, 31 March 1916)
    remove_circle D0101549
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 23 December 1913)
    done D0101519
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 11 July 1915)
    done D0101502
  • Ferruccio Busoni to Frieda Kwast-Hodapp (Zürich, 1 January 1918)
    warning D0102205
  • Ferruccio Busoni to Hugo Leichtentritt ([Berlin], 27 June 1912)
    build D0101543
  • Hugo Leichtentritt to Ferruccio Busoni (Berlin, 29 March 1916)
    done D0101509
  • Ferruccio Busoni to Hugo Leichtentritt (Berlin, 4 September 1912)
    done D0101516
  • Ferruccio Busoni to Hugo Leichtentritt (Berlin, 25 February 1914)
    remove_circle D0101521
  • Ferruccio Busoni to Hans Huber (22 May 1917, prob. Zurich)
    build D0100183

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