Columbia subject headings:
English literature--Welsh authors--History and criticism.
Wales--History--20th century.
Harvard subject headings:
English literature--Welsh authors--History and criticism
Wales--In literature.
Wales--Intellectual life--20th century.
Welsh literature--20th century--History and criticism.
Princeton subject headings:
English literature--Welsh authors--History and criticism.
Wales--History--20th century.
Welsh literature--English authors--History and criticism.