Columbia subject headings:
Harvard subject headings:
English literature--Welsh authors--Bio-bibliography.
English literature--Welsh authors--Dictionaries.
English literature--Welsh authors--Encyclopedias.
Wales--Encyclopedias.
Wales--In literature--Encyclopedias.
Welsh literature--Bio-bibliography.
Welsh literature--Dictionaries.
Welsh literature--Encyclopedias.
Princeton subject headings:
Encyclopedias.
English literature--Welsh authors--Encyclopedias.
Wales--Encyclopedias.
Wales--In literature--Encyclopedias.
Welsh literature--Encyclopedias.