History: A pile of American bison skulls waiting to be ground for fertilizer, mid-1870s [2845x2224]

http://i.imgur.com/wwqLa1Q.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/59k9ww/a_pile_of_american_bison_skulls_waiting_to_be/?utm_source=ifttt