Photograph 1892 of a pile of <a href="https://en.wikipedia.org/wiki/American_bison" class="extiw" title="w:American bison">American bison</a> skulls waiting to be ground for fertilizer.
Unknown author<span style="display: none;">Unknown author</span><br>Photo edited by <a href="//commons.wikimedia.org/wiki/User:Pawe%C5%82MM" title="User:PawełMM">User:PawełMM</a>
circa 1892 <div style="display: none;">date QS:P,+1892-00-00T00:00:00Z/9,P1480,Q5727902</div>
Burton Historical Collection, Detroit Public Library