Columbia subject headings:
Duero River Valley (Spain and Portugal)--History--Sources.
Salamanca (Spain)--History--Sources.
Spain--History--711-1516--Sources.
Harvard subject headings:
Duero River Valley (Spain and Portugal)--History--Sources.
Salamanca (Spain)--History--Sources.
Spain--History--711-1516--Sources.
Princeton subject headings:
Arabic literature--Spain--History and criticism.
Salamanca (Spain)--History--Sources.
Salamanca (Spain)--In literature.