After arriving in the Americas, Christopher Columbus penned a letter about his find to Spain's King Ferdinand, a letter that would later be published to spread the news throughout Europe. For the fourth time in the past four years, federal agents and attorneys in Delaware have recovered a stolen copy of that historic letter, now worth up to $1.3 million.

The U.S. Attorney’s Office in Delaware and Homeland Security investigators, who specialize in the recovery of stolen rare books and historic artifacts, announced the find this week.