Baghdad; metropolis of the Abbasid caliphate. 2026-02-15T22:07:55+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Wiet, Gaston, 1887- (The Centers of civilization series, 1971)