Columbia subject headings:
Charlemagne, Emperor, 742-814--In literature.
Mexico--History--Conquest, 1519-1540.
Mexico--In literature.
Spanish literature--Classical period, 1500-1700--History and criticism.
Harvard subject headings:
Charlemagne, Emperor, 742-814--In literature.
Mexico--History--Conquest, 1519-1540--In literature.
Mexico--History--Conquest, 1519-1540.
Spanish literature--Classical period, 1500-1700--History and criticism
Princeton subject headings: