Columbia subject headings:
Iberian Peninsula--Intellectual life--19th century.
Iberian Peninsula--Intellectual life--20th century.
Politics and literature--Iberian Peninsula.
Portugal--Relations--Spain.
Romance-language literature--Iberian Peninsula--History and criticism.
Spain--Relations--Portugal.
Supranationalism--Iberian Peninsula.
Harvard subject headings:
Iberian Peninsula--Intellectual life--19th century.
Iberian Peninsula--Intellectual life--20th century.
Politics and literature--Iberian Peninsula.
Portugal--Relations--Spain.
Romance-language literature--Iberian Peninsula--History and criticism.
Spain--Relations--Portugal.
Supranationalism--Iberian Peninsula.
Princeton subject headings:
Comparative literature--Portuguese and Spanish.
Comparative literature--Spanish and Portuguese.
Portugal--Intellectual life--20th century.
Portugal--Relations--Spain--History--20th century.
Spain--Intellectual life--20th century.
Spain--Relations--Portugal--History--20th century.