Herman Kater, Amsterdam
Galerie Ferdinand van Dieten-d’Eendt, Amsterdam
Collection ProWinko, the Netherlands. Acquired from the above in 2007
1982, Constant. Aquarellen en grafiek, Galerie Collection d'Art, Amsterdam
1995, Constant. Aquarellen | Watercolors 1975-1995, Gemeentemuseum, The Hague (ill.cat.)
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