- The Thomas de Hartmann Papers - http://webtext.library.yale.edu/xml2html/music/ht-d.htm
Documents de Hartmann's life and work through musical sketches, manuscript scores, and printed music and contain materials relating to G. I. Gurdjieff.
- Anderson, Margaret C. - http://www.uwm.edu/Library/arch/findaids/uwmmss12.htm
Archives finding aid. Letters, photos and manuscripts.
- Fritz Peters - http://www.fritzpeters.info/
Dedicated to Fritz Peters (1913-1979), Gurdjieff memoirist and American novelist.
- Lord John Pentland - http://www.gurdjieff.org/pentland.htm
Synopsis of Lord John Pentland (1907–1984) who Gurdjieff choose to lead the Work in America
- Jeanne de Salzmann - http://www.gurdjieff.org/salzmann.htm
A short synopsis of Jeanne de Salzmann (1889–1990). She lead the worldwide Work after Gurdjieff's death in 1949 until her death in 1990.
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