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)
1992 Cobra Poésie Jean Clarence Lambert
1992 Cobra Poésie Jean Clarence Lambert, Jens August Schade, Carl Henning Pedersen
1998 Cobra | 50 jaar
1975 Cobra | Frans Halsmuseum, Haarlem Erik Slagter, J. Zumbrink
1988 Cobra | Kunstauktion 367
1988 Cobra | Kunstauktion 373
2003 CoBrA, de kleur van vrijheid Marcel Hummelink, Klawa Koppenol, Christel Kordes
1985 Cobra, Spur, Wir, Geflecht, Kollektiv Herzogstrasse Renate Bachmayer, Helmut Rieger
1983 COBRA, un art libre Jean-Clarence Lambert
2003 CoBrA. Terug uit de Hermitage Willemijn Stokvis, John Vrieze
1998 Cobraland Christian Dotremont
1967 Code Jean-Clarence Lambert
2001 Coeur ou abîme Jean-Clarence Lambert, Farid Belkahia
1960 Collectie Thyssen-Bornemisza J.C. Ebbinge Wubben
1998 Collection d'architecture du centre georges… Alain Guiheux
Collection of maps and travel guides (first half)
Collection of maps and travel guides (second half)
1979 Colleges Ludwig Wittgenstein
1938 Colonel Chabert Honoré de Balzac
1988 Commentaires sur la Société du Spectacle Guy Debord
1995 Commissieleden! Cornel Bierens
1971 Commune de Paris André Benedetto
1971 Commune Opstand H. Dijkstra
1971 Communes de province, commune de Paris 1870-1871 Jeanne Gaillard
1960 Communitas Paul Goodman, Percival Goodman
2001 Connexxion Connexxion
1991 Considering the Accused Antoine Willem Michel Mooij, Frans Koenraadt, Johanna Lommen-van Alphen
2002 Constable Pierre Wat
1988 Constable John Sunderland
1979 Constable John Walker
2003 Constable to Delacroix Stephen Bann, David Blayne Brown, Rachel Meredith
1991 Constant Hans Platschek
1986 Constant Klaus Honnef
1974 Constant Michel Ragon
1979 Constant Fanny Kelk, , Constant
1985 Constant Gisela Burkamp
1998 Constant Josefina Núñez
1959 Constant Constant Nieuwenhuys
2000 Constant Jean-Clarence Lambert
2004 Constant Philippe Dagen, Trudy van der Horst
1996 Constant Frits Keers, Rudi Fuchs
2001 Constant Musée Picasso Antibes
1995 Constant J.C. Locher
1986 Constant Christoph B. Rüger
1981 Constant Freddy de Vree
1992 Constant Jean-Clarence Lambert
Constant Jean Clarence Lambert
1994 Constant Jean-Clarence Lambert
1994 Constant Jean Clarence Lambert
2000 Constant Constant Nieuwenhuys