Columbia subject headings:
Kuro-gu (Seoul, Korea)--Social conditions.
Sŏul Kuro Kongdan--History.
Harvard subject headings:
Church and social problems--Korea (South)--Seoul--History.
Industrial districts--Korea (South)--Seoul--History.
Labor movement--Korea (South)--History
Sŏul Kuro Kongdan--History.
Working class--Religious life--Korea (South)--Seoul--History.
Princeton subject headings: