Engraving on p. 12 of Louis Bertrand, <i>Histoire de la démocratie et du socialisme en Belgique depuis 1830</i>, vol. 1, Brussels: Dechenne et Cie; Paris: Édouard Cornély et Cie, 1906, 455 pages.
<div class="fn value">
<span lang="en">Anonymous</span><span style="display:none">Unknown author</span></div>
1906<div style="display: none;">date QS:P571,+1906-00-00T00:00:00Z/9</div>
From the digital edition made by M. Gustave Swaelens, volunteer, retired journalist, Switzerland.