Columbia subject headings:
Harvard subject headings:
Alfonso X, King of Castile and Leon, 1221-1284. Primera crónica general--Sources.
Alfonso X, King of Castile and Leon, 1221-1284. Primera crónica general.
Orosius, Paulus.
Princeton subject headings:
Alfonso X, King of Castile and Leon, 1221-1284. Primeira crónica general. Selections.
Orosius, Paulus.