Columbia subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Criticism and interpretation.
Harvard subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Criticism and interpretation.
Galician literature--Criticism and interpretation.
Portuguese literature--To 1500--Criticism and interpretation.
Princeton subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Criticism and interpretation.