<a href="//commons.wikimedia.org/wiki/Carl_Robert" title="Carl Robert">Carl Robert</a> (1850–1922)
Unknown author<span style="display: none;">Unknown author</span>
Unknown date<div style="display: none;">Unknown date</div> (before 1922 for sure, very likely before 1900)
<a rel="nofollow" class="external free" href="http://www.catalogus-professorum-halensis.de/robertcarl.html">http://www.catalogus-professorum-halensis.de/robertcarl.html</a>