Columbia subject headings:
Harvard subject headings:
Welsh language--Glossaries, vocabularies, etc.
Welsh language--Middle Welsh, 1100-1400--Glossaries, vocabularies, etc.
Princeton subject headings:
English language--Dialects--Wales, South--Glossaries, vocabularies, etc.
English language--Wales, South--Foreign words and phrases--Dictionaries.
Wales, South--History--Dictionaries.