Columbia subject headings:
Alfonso X, King of Castile and Leon, 1221-1284. General estoria.
World history--Early works to 1800.
Harvard subject headings:
Alfonso X, King of Castile and Leon, 1221-1284. General estoria.
Middle Ages--Historiography
World history--Early works to 1800
World history--Historiography.
Princeton subject headings:
Alfonso X, King of Castile and Leon, 1221-1284. General estoria.