1. Sonsbeek 71 , Sonsbeek buiten de perken, Deel 1/Part 1, June 19 - August 15, 1971 Artist: Park Sonsbeek Classification: Documentation Materials: Exhibition catalog, 231 pages. Accession Number: 2010.49.28
2. Sonsbeek 71 , Sonsbeek buiten de perken, Deel 2/Part 2, June 19 - August 15, 1971 Artist: Park Sonsbeek Classification: Documentation Materials: Exhibition catalog, 96 pages. Accession Number: 2010.49.29