Columbia subject headings:
Harvard subject headings:
Canada--Languages--Political aspects--Congresses.
Europe--Languages--Political aspects--Congresses.
Language policy--Congresses.
Linguistic minorities--Congresses.
Romance languages--Political aspects--Congresses.
South America--Languages--Political aspects--Congresses.
Princeton subject headings:
Canada--Languages--Political aspects--Congresses.
Europe--Languages--Political aspects--Congresses.
Language policy--Congresses.
Linguistic minorities--Congresses.
Romance languages--Political aspects--Congresses.
South America--Languages--Political aspects--Congresses.