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For his work as a draftsman, Constant received the David Roëll Award during the exhibition Constant, An illustration of freedom at the Stedelijk Museum Amsterdam. Catalogue text by Fanny Kelk.

Letters from several people and correspondence between Constant and Eddy de Wilde about L'Interrogatoire (1983), which was exhibited at the exhibition La Grande Parade in Stedelijk Museum Amsterdam. 

In 1971 Constant Nieuwenhuys declines the title, Ridder in de orde van Oranje-Nassau. Persons eligible for an award in this order are those who have made a special contribution to society. 

The notes are reflections on other painters and Constant his own work. 
ca 1978

Correspondence with Gemeentemuseum Den Haag, Bielefelder Kunstverein and Gisela Burkamp curator at the Kulturhistorischen Museum, regarding the exhibition Constant | Arbeiten auf Papier 1948-1985. 

ca 1990

In 1988 the Dutch PTT created a series of three postage stamps. The stamps were designed by Jan Bons and contained paintings by Appel, Constant and Corneille. 

• Correspondence between Irina Lambert and Constant regarding Irina's translations 
• Notes from Constant 
• Text with notes named, Proloog
• Translated text, Het aangezicht der aard (Le visage de la Terre ), in French by Irina Lambert-Paslariu. (exhibition catalogue New Babylon, Gemeentemuseum The Hague, 1974). 

Correspondence between Centre Pompidou Paris, Gemeentemuseum Den Haag and Constant, regarding the exhibition The Situationists International 1957-1972, Paris. 

Correspondence with Frances Morrito and Alan Bowness from Tate Gallery London, regarding the documentation of Après nous la Liberté, 1949.