Ludwig Wittgenstein (1899–1951). Austrian National Library, Accession number Pf 42.805 : C (1)
<bdi><a href="https://en.wikipedia.org/wiki/en:Moritz_N%C3%A4hr" class="extiw" title="w:en:Moritz Nähr"><span title="Austrian photographer (1859-1945)">Moritz Nähr</span></a>
</bdi>
1930
<a rel="nofollow" class="external text" href="https://www.bildarchivaustria.at/Pages/ImageDetail.aspx?p_iBildID=13887013">Austrian National Library</a>