Columbia subject headings:
Harvard subject headings:
Europe--Languages--Congresses.
European Charter for Regional or Minority Languages--Congresses.
Language policy--Europe--Region--Congresses.
Language policy--Europe--Regions--Congresses.
Linguistic minorities--Europe--Congresses.
Princeton subject headings:
Europe--Languages--Congresses.
European Charter for Regional or Minority Languages--Congresses.
Language policy--Europe--Regions--Congresses.
Linguistic minorities--Europe--Congresses.