Columbia subject headings:
Hamgyŏng-bukto (Korea)--Economic conditions--20th century.
Hamgyŏng-bukto (Korea)--Social conditions--20th century.
Harvard subject headings:
Hamgyŏng-bukto (Korea)--Economic conditions--20th century.
Hamgyŏng-bukto (Korea)--Social conditions--20th century.
Japan--Colonies--Korea (North)--Hamgyŏng-bukto.
Princeton subject headings:
Hamgyŏng-bukto (Korea)--Economic conditions--20th century.
Hamgyŏng-bukto (Korea)--Social conditions--20th century.
Japan--Colonies--Korea (North)--Hamgyŏng-bukto.