Columbia subject headings:
Spanish poetry--18th century--History and criticism.
Spanish poetry--Classical period, 1500-1700--History and criticism.
Harvard subject headings:
Dialogue in literature.
Oral tradition in literature.
Spanish poetry--To 1500--History and criticism
Princeton subject headings:
Spanish poetry--18th century--History and criticism.
Spanish poetry--Classical period, 1500-1700--History and criticism.