Columbia subject headings:
Belgium--Economic conditions.
Belgium--Social conditions.
Economic history--Periodicals.
Economic history--Societies, etc.
Social history--Periodicals.
Social sciences--Periodicals.
Harvard subject headings:
Princeton subject headings:
Belgium--Economic conditions--History.
Belgium--Economic conditions.
Belgium--Social conditions--History.
Belgium--Social conditions.
Economic history--Periodicals.
Economic history--Societies, etc.
Periodicals.
Social history--Periodicals, etc.
Social sciences--Periodicals.