English: Graduation of Mr. Pieter van Vollenhoven at Leiden University (The Netherlands), 30 November 1965. From left to right: princess Christina, princess Margriet, Pieter van Vollenhoven, mrs. Van Vollenhoven-De Lange and Prof. J.M. van Bemmelen
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It has been requested to crop a part of this image, so that the cropped part can serve as its own image for Jacob Maarten van Bemmelen.