http://www.oddee.com/item_98717.aspx
http://www.moneysupermarket.com/money/treasure-hunt-finds.aspx
http://mentalfloss.com/uk/history/27932/7-of-the-biggest-treasure-troves-ever-found
http://www.reuters.com/article/us-usa-california-coins-idUSBREA1P03M20140226
http://www.history.com/news/history-lists/7-historical-treasures-discovered-by-accident