Photograph of <a href="https://en.wikipedia.org/wiki/Charles_Dupin" class="extiw" title="w:Charles Dupin">Charles Dupin</a> (1784–1873) French mathematician, engineer, economist and politician.
<bdi><a href="https://en.wikipedia.org/wiki/en:Pierre_Petit_(photographer)" class="extiw" title="w:en:Pierre Petit (photographer)"><span title="French photographer (1831–1909)">Pierre Petit</span></a>
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<a rel="nofollow" class="external text" href="http://gallica.bnf.fr/ark:/12148/btv1b8450926s">Bibliothèque nationale de France, département Société de Géographie</a>