الدراسات التاريخية

WORLD HISTORY – Cultures, States, and Societies to 1500:

In 1952, at the age of 77 and suffering with an abdominal hernia long overdue for surgery, Sellards returned to Vero to collect charcoal or bone suitable for the newly invented technique of radiocarbon dating. … His longtime field assistant Glen Evans accompanied him, having left Texas with careful instructions from Sellard’s physician about what to do if the hernia suddenly bulged.