Columbia subject headings:
Harvard subject headings:
Linguistic change--America--Congresses.
Linguistic change--Congresses.
Romance languages--Variation--America--Congresses.
Romance languages--Variation--Congresses.
Princeton subject headings:
Linguistic change--America--Congresses.
Linguistic change--Congresses.
Romance languages--Variation--America--Congresses.
Romance languages--Variation--Congresses.