Columbia subject headings:
Cultural pluralism--Spain--Congresses.
Ethnicity--Spain--Congresses.
Linguistic minorities--Spain--Congresses.
Multilingualism--Spain--Congresses.
Spain--Languages--Congresses.
Harvard subject headings:
Cultural pluralism--Spain--Congresses.
Ethnicity--Spain--Congresses.
Language and languages--Variation--Congresses
Language and languages--Variation--Spain--Congresses.
Language policy--Spain--Congresses.
Linguistic minorities--Spain--Congresses.
Multilingualism--Spain--Congresses.
Princeton subject headings: