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The Thomas de Hartmann papers
- "The Thomas de Hartmann Papers document de Hartmann's life and work through musical sketches, manuscript scores, and printed music; librettos and scenarios for stage works; correspondence with composers, conductors, and musical performers; photographs; and miscellaneous materials relating to de Hartmann, G.I. Gurdjieff, and Wassily Kandinsky."
- "Records and correspondence"
- "The Thomas de Hartmann papers"