Photo of a gelatin lift of a footwear impression.
<a href="//commons.wikimedia.org/w/index.php?title=User:Zalman992&amp;action=edit&amp;redlink=1" class="new" title="User:Zalman992 (page does not exist)">Zalman992</a>
2016-09-21
<span class="int-own-work" lang="en">Own work</span>