Columbia subject headings:
Harvard subject headings:
Agriculture--France--Ile-de-France--History--Congresses.
Île-de-France (France)--Commerce--History--Congresses.
Île-de-France (France)--Economic conditions--Congresses.
Île-de-France (France)--History--Congresses.
Princeton subject headings:
Agriculture--France--Ile-de-France--History--Congresses.
Île-de-France (France)--Commerce--History--Congresses.
Île-de-France (France)--Economic conditions--Congresses.
Île-de-France (France)--History--Congresses.