Olga und Thomas de Hartmann: Biografien | Chalice Verlag
Thomas de Hartmann | Spotify
Thomas de Hartmann (Composer, Arranger) - Short Biography
Sacred Honey | Alessandra Celletti
The Thomas de Hartmann Project
Why Has Ukranian Composer Thomas de Hartmann Been So Neglected?
Gurdjieff - De Hartmann Vol 04: Meditation, par Alain Kremski - YouTube
Why Has Ukranian Composer Thomas de Hartmann Been So Neglected?
Thomas de Hartmann | Spotify
GURDJIEFF / DE HARTMANN: COMPLETE MUSIC FOR THE PIANO - Klassiek.nl
Dust explosion hazard (screening) with the Hartmann tube - consilab Gesellschaft für Anlagensicherheit mbH
Thomas de Hartmann - Wikipedia
Thomas De Hartmann Discography | Discogs
The Thomas de Hartmann Project
Thomas De Hartmann music, videos, stats, and photos | Last.fm
Why Has Ukranian Composer Thomas de Hartmann Been So Neglected?
The Gurdjieff Legacy Foundation Archives
The Music Of Gurdjieff / De Hartmann | Light In The Attic Records
The Chamber Music of Thomas de Hartmann by Elan Sicroff on Apple Music
Gurdjieff / De Hartmann – The Music Of Gurdjieff / De Hartmann (1985, Vinyl) - Discogs
PDF) Gurdjieff and Music: The Gurdjieff/de Hartmann Piano Music and its Esoteric Significance | Johanna Petsche - Academia.edu
The Music of Gurdjieff / de Hartmann
Thomas de Hartmann (Composer, Arranger) - Short Biography
