82 doctorate graduates, who passed the doctoral exams organised by the Le and Mac dynasties from 1442 to 1779, engraved on stone stelae in the Hanoi-based Van Mieu-Quoc Tu Giam (Temple of Literature), were recognised as the world’s document heritage, announced UNESCO on March 3rd at an annual meeting of the World’s Memory Committee-Pacific Asia, held in Macau, China.