Columbia subject headings:
Harvard subject headings:
Belgium--Economic conditions--1945-
Coal miners--Belgium.
Coal miners--Germany.
Prisoners of war--Belgium.
Prisoners of war--Germany
World War, 1939-1945--Prisoners and prisons, Belgian.
World War, 1939-1945--Prisoners and prisons, German.
Princeton subject headings:
Belgium--Economic conditions--1945-
Coal miners--Belgium.
Coal miners--Germany.
Prisoners of war--Belgium.
Prisoners of war--Germany.
World War, 1939-1945--Prisoners and prisons, Belgian.
World War, 1939-1945--Prisoners and prisons, German.