Columbia subject headings:
Harbors--Korea (South)--Yŏngsan River Region--History.
Inland water transportation--Korea (South)--Yŏngsan River Region--History.
Yŏngsan River Region (Korea)--Social life and customs.
Harvard subject headings:
Harbors--Korea (South)--Chŏlla-namdo--History.
Rivers--Korea (South)--Chŏlla-namdo--History.
Yŏngsan River (Korea)
Princeton subject headings: