Columbia subject headings:
Dialectology.
English language--Dialectology.
English language--Variation.
Historical linguistics.
Language and languages--Variation.
Harvard subject headings:
Dialectology--Congresses.
English language--Dialectology--Congresses.
English language--Variation--Congresses.
Historical linguistics--Congresses.
Language and languages--Variation--Congresses
Princeton subject headings:
Dialectology.
English language--Dialectology.
English language--Variation.
Historical linguistics.
Language and languages--Variation.