Thomas de Hartmann - Wikipedia
The Thomas de Hartmann Project
PDF) Gurdjieff and Music: The Gurdjieff/de Hartmann Piano Music and its Esoteric Significance | Johanna Petsche - Academia.edu
Thomas de Hartmann (Composer, Arranger) - Short Biography
Catalogue of Compositions – The Thomas de Hartmann Project
Gurdjieff / De Hartmann – The Music Of Gurdjieff / De Hartmann (1985, Vinyl) - Discogs
Thomas de Hartmann - Vrije Geluiden - VPRO
On Olga de Hartmann
Thomas de Hartmann
Why Has Ukranian Composer Thomas de Hartmann Been So Neglected?
Why Has Ukranian Composer Thomas de Hartmann Been So Neglected?
The Piano Music of Thomas de Hartmann by Elan Sicroff on Apple Music
Thomas de Hartmann on Apple Music
Olga und Thomas de Hartmann: Biografien | Chalice Verlag
Hartmann's operation - Wikipedia
The Music Of Gurdjieff / De Hartmann | Light In The Attic Records
Why Has Ukranian Composer Thomas de Hartmann Been So Neglected?
