Auguste Piccard op het Rotterdamse vliegveld Waalhaven, 1931
Unknown author<span style="display: none;">Unknown author</span>
1931
1931 picture (found online at <a rel="nofollow" class="external text" href="https://resolver.kb.nl/resolve?urn=urn:gvn:SFA03:SFA022003196">Geheugen van Nederland</a>)