4hak tongsa 4학통사(四學通事)
RO : 4hak tongsa MC : 4hak t’ongsa
Year : 1393-1894
Categories : Diplomacy·International Relations>Diplomatic Institutions·Embassies
UF :
Sahak tongsa
RT :
4hak@Eohak
BT :
Tongsa@Joseon