Columbia subject headings:
English literature--Welsh authors--History and criticism.
Thomas, M. Wynn.
Welsh literature--History and criticism.
Harvard subject headings:
English literature--Welsh authors--History and criticism
Thomas, M. Wynn--Bibliography.
Welsh literature--History and criticism.
Princeton subject headings:
English literature--Welsh authors--History and criticism.
Thomas, M. Wynn--Bibliography.
Welsh literature--History and criticism.