Columbia subject headings:
France--Economic conditions--19th century--Congresses.
France--Economic conditions--20th century--Congresses.
Spain--Economic conditions--19th century--Congresses.
Spain--Economic conditions--20th century--Congresses.
Harvard subject headings:
France--Economic conditions--19th century--Congresses.
France--Economic conditions--19th century.
France--Economic conditions--20th century--Congresses.
France--Economic conditions--20th century.
Spain--Economic conditions--19th century--Congresses.
Spain--Economic conditions--19th century.
Spain--Economic conditions--20th century--Congresses.
Spain--Economic conditions--20th century.
Princeton subject headings:
France--Economic conditions--19th century.
France--Economic conditions--20th century.
Spain--Economic conditions--19th century.
Spain--Economic conditions--20th century.