Columbia subject headings:
Linguistic geography--Data processing.
Welsh language--Dialects--Data processing.
Welsh language--Dialects--Research.
Harvard subject headings:
Welsh language--Dialects.
Welsh language--Morphology.
Welsh language--Morphophonemics.
Welsh language--Phonology.
Princeton subject headings:
Welsh language--Dialects--Glossaries, vocabularies, etc.
Welsh language--Dialects--Phonology.