Alfred Richard Orage
   Wikipedia's biography of his life.
   http://en.wikipedia.org/wiki/Alfred_Richard_Orage

Anderson, Margaret C.
   Archives finding aid. Letters, photos and manuscripts.
   http://www.uwm.edu/Library/arch/findaids/uwmmss12.htm

Fritz Peters
   Dedicated to Fritz Peters (1913-1979), he is most well known for his memoirs covering his early years living at G. I. Gurdjieff's Institute for the Harmonious Development of Man.
   http://www.fritzpeters.info/

Jean Toomer
   Wikipedia's biography of his life.
   http://en.wikipedia.org/wiki/Jean_Toomer

Jeanne de Salzmann
   Wikipedia's biography of her life.
   http://en.wikipedia.org/wiki/Jeanne_de_Salzmann

John G. Bennett
   Wikipedia's biography of his life.
   http://en.wikipedia.org/wiki/John_G._Bennett

Margaret Caroline Anderson
   Wikipedia's biography of her life.
   http://en.wikipedia.org/wiki/Margaret_Caroline_Anderson

René Daumal
   Wikipedia's biography of his life.
   http://en.wikipedia.org/wiki/Rene_Daumal

The Thomas de Hartmann Papers
   Documents de Hartmann's life and work through musical sketches, manuscript scores, and printed music and contains materials relating to G.I. Gurdjieff.
   http://webtext.library.yale.edu/xml2html/music/ht-d.htm

Thomas and Olga de Hartmann
   Wikipedia's very short biography of the Thomas and Olga de Hartmann
   http://en.wikipedia.org/wiki/Thomas_and_Olga_de_Hartmann