Ludwig Wittgenstein in his youth.
Unknown author<span style="display: none;">Unknown author</span>
1910s <div style="display: none;">date QS:P,+1910-00-00T00:00:00Z/8</div>
<a rel="nofollow" class="external autonumber" href="http://www.wittgen-cam.ac.uk/cgi-bin/text/biogre2.html">[1]</a>