Columbia subject headings:
Harvard subject headings:
Coal mines and mining--Japan--Hokkaido--Management--History--20th century--Case studies.
Forced labor--Japan--Hokkaido--History--20th century--Case studies.
Industrial relations--Japan--Hokkaido--History--20th century.
Personal management--Japan--Hokkaido--History.
Princeton subject headings:
Coal mines and mining--Japan--Hokkaido--Management--History.
Forced labor--Japan--Hokkaido--History.
Industrial relations--Japan--Hokkaido--History.
Personal management--Japan--Hokkaido--History.
Service, Compulsory non-military--Japan--Hokkaido.
World War, 1939-1945--Conscript labor--Japan--Hokkaido.