É. Apor (ed.): Stein, Aurel: Old Routes of Western Iran. (Budapest Oriental Reprints, Ser. B 2.)
Chapter II. —In Kohgalu Tracts
21. CHAHÄR-TAQ RUIN AT KHAIRÄBÄD BRIDGE 20. PIER AND ARCH OF SASANIAN BRIDGE, KHAIRÄBÄD Remains of later bridge on right bank seen in distance
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