Columbia subject headings:
Harvard subject headings:
English language--Middle English, 1100-1500--Dialectology.
English language--Middle English, 1100-1500--Grammar, Historical.
Princeton subject headings:
English language--Middle English, 1100-1500--Dialects.
English language--Middle English, 1100-1500--Grammar, Historical.
Historical linguistics--Great Britain.
Linguistic change--Great Britain.