Columbia subject headings:
Spanish literature--Basque authors--History and criticism.
Harvard subject headings:
Spanish literature--20th century--History and criticism
Spanish literature--Basque authors--History and criticism.
Princeton subject headings:
Spanish literature--20th century--History and criticism.
Spanish literature--Basque authors--History and criticism.
Spanish poetry--20th century--History and criticism.
Spanish poetry--Basque authors--History and criticism.