Columbia subject headings:
Immigrants--France--Lorraine--Social conditions--Congresses.
Lorraine (France)--Ethnic relations--Congresses.
Harvard subject headings:
Immigrants--France--Lorraine--Social conditions--Congresses.
Lorraine (France)--Ethnic relations--Congresses.
Princeton subject headings:
Immigrants--Cultural assimilation--France--Lorraine--History--Congresses.
Lorraine (France)--Emigration and immigration--History--Congresses.