Haags Gemeentemuseum # CONSTANT, New Babylon # poster,1974, B--
Armando Museum # CONSTANT/PERMEKE # 2004, signed, mint
Witte de With # #1 FROM WITTE DE WITH , incl New Babylon # 1999, mint
Haags Gemeentemuseum # CONSTANT, New Babylon # A1 poster, 1980, nm+
G.I.N. gallery # CONSTANT # 1979, mint--
Constant / Kouwenaar,COBRA# GOEDEMORGEN HAAN# facsimile
David Roellprijs # CONSTANT # 1974, mint