Columbia subject headings:
Alfonso X, King of Castile and Leon, 1221-1284. Primera crónica general.
Spain--History--711-1516--Historiography.
Spain--History--711-1516--Sources.
Harvard subject headings:
Alfonso X, King of Castile and Leon, 1221-1284. Primera crónica general.
Spain--History--711-1516--Historiography.
Spain--History--711-1516--Sources
Princeton subject headings:
Alfonso X, King of Castile and Leon, 1221-1284. Primera crónica general.
Spain--History--711-1516--Historiography.
Spain--History--711-1516--Sources.