Columbia subject headings:
Harvard subject headings:
Korea--Relations--Japan--Tsushima Island--Sources--Bibliography.
Sō family--Archives--Catalogs.
Tsusima Island (Japan)--Relations--Korea--Source--Bibliography.
Princeton subject headings:
Korea--History--Chosŏn dynasty, 1392-1910--Sources--Bibliography.
Korea--Relations--Japan--Tsushima-han--Sources--Bibliography.
So family--Archives.
Tsushima-han (Japan)--Relations--Korea--Sources--Bibliography.