Columbia subject headings:
Harvard subject headings:
Linguistics--Spain--History--19th century.
Linguistics--Spain--History--20th century.
Linguistics--Spain--History.
Unamuno, Miguel de, 1864-1936--Criticism and interpretation.
Unamuno, Miguel de, 1864-1936--Knowledge--Linguistics.
Unamuno, Miguel de, 1864-1936--Language.
Princeton subject headings:
Unamuno, Miguel de, 1864-1936--Language.