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 Sort ascending Author(s)
1963 The Kama Sutra Vatsyayana
1991 The Issenheim Altar Pantxika Béguerie
1949 The insect world of J. Henri Fabre Henri Fabre
1981 The Indians of the great plains Norman Bancroft-Hunt, Werner Forman
1960 The Image of the City Kevin Lynch
1956 The Holy Family or Critique of Critical Critique Karl Marx, Friedrich Engels
1972 The History and Restoration of le Clos-Lucé Hubert Saint-Bris
1967 The Hermitage Pierre Descargues
1965 The Harem N.M. Penzer
1963 The Gypsies Jean-Paul Ciebert
1996 The Greek World Giovanni Pugliese Carratelli
1968 The Great Age of Fresco The Metropolitan Museum of Art
1984 The genius of Venice Charles Hope, Jean Martineau
2001 The Game of War Andrew Hussey
1981 The Galleries of the Accademia Francesco Valcanover
2000 The Frari's Basilica Luciano Marini
1943 The Fireside book of Dog Stories Jack Goodman, ed.
1971 The Family: Revolutionary or Oppressive Force Caroline Lund
1998 The Face in the Corner Robin Gibson
1997 The Eugène Delacroix Museum Arlette Sérullaz
1913 The Ethics of the Dust John Ruskin
1975 The Erotic Arts Peter Webb
1991 The Enneads Plotinus
1995 The dutch republic Jonathan Israel
1970 The drawings of Watteau Malcolm Cormack
1997 The Dodge's Palace in Venice Eugenia Bianchi, Nadia Righi,, Maria Christina Terzaghi
1979 The decorated Body Robert Brain
1930 The Crown of Wild Olive, The Cestus of Aglaia John Ruskin
1932 The Cowboy Sings Kenneth Clark
1978 The Complete Works of William Shakespeare William Shakespeare
1997 The Collection of Victor and Sally Ganz Christopher Burge
1982 The Codex Hammer of Leonardo da Vinci J. Roberts, C. Pedretti
1999 The Cobra Movement Karin Lodders-Blauw
1961 The City in History Lewis Mumford
1972 The Book of Reptiles R. Lanworn
1945 The Bayeux Tapestry Eric Maclagan
1974 The Barye Bronzes Stuart Pivar
1971 The Attainment of Delacroix Frank Anderson Trapp
1958 The Atom and the Energy Revolution Noman Lansdell
1985 The Artist's Handbook of Materials and Techniques Ralph Mayer
1998 The Art of the Accident Andreas Broeckman, Joke Brouwer, Bart Lootsma
1962 The Art of Etching E.S. Lumsden
1958 The American Museum of Natural of History III Edward Weyer
1958 The American Museum of Natural of History II Edward Weyer
1958 The American Museum of Natural of History I Edward Weyer
1958 The American Museum of Natural of History Edward Weyer
1979 The age of Utamaro C. van Rappard-Boon
1977 The age of Harunobu C. van Rappard-Boon
1999 The Activist Drawing Catherine de Zegher, Mark Wigley
1982 Texte zur Kunst 1957-1982 Otto van de Loo