Dutch/American economist Tjalling Koopmans receives honorary doctorate from Catholic University Leuven (Belgium), Seal of Leuven University is visible on Koopmans' left shoulder. Date: 2 Febr. 1967. Image cropped from original at Nationaal Archief NL, in Commons: VisserTHooftKoopmans1967
<a href="//commons.wikimedia.org/wiki/Category:Eric_Koch" title="Category:Eric Koch">Eric Koch</a> for <a href="//commons.wikimedia.org/wiki/Category:Anefo" title="Category:Anefo">Anefo</a>
1967-02-02
<a rel="nofollow" class="external text" href="http://proxy.handle.net/10648/ab0e616e-d0b4-102d-bcf8-003048976d84">GaHetNa (Nationaal Archief NL)</a>