Queen Juliana of the Netherlands at the reunion of the Foundation of the Circle of Friends of former prisoners from the Natzweiler Concentration Camp. Front row, from left to right: Kees Cath, Queen Juliana, Floris Bakels (?), Dolf Cohen (Leiden rector). Second row right: Leiden mayor Aat (A.J.) Vis (?). Academy Building Leiden University, 25 October 1975