Each volume (tome) in this series covers a decade of the artist's work. Each tome is separated into different parts (fasicules) composed of a catalogue raisonné and an accompanying supplement called the "Cahier d'archives", which contains critical and biographical material. The Cahier d'archives includes texts by Erich Franz, Friedemann Malsch, Annie Claustres, Daniela Goeller, and Emmy de Maratelaere.