Diederik Korteweg, Roland W. Weitzenböck, and Remmelt Sissingh, 1926 at Amsterdam University)
Unknown photographer
1926-10-25
<a rel="nofollow" class="external text" href="http://proxy.handle.net/10648/adf60f62-d0b4-102d-bcf8-003048976d84">GaHetNa (Nationaal Archief NL)</a>