Constant’s personal library was documented in 2019-2020. The project was supported by Stichting Dioraphte, Gravin van Bylandt Stichting and Fundatie Van den Santheuvel, Sobbe.

Year Title Author(s) CID
De Schilderijen van Bruegel Fritz Grossman 6255
Quatorze Affiches de la Commune de Paris - 6389