Title: Razvitie na promishlenostta v I͡Ambolski okrŭg, 1882-1947 godina
Subjects: Bibliography, Catalogs, Drekt︠s︡ii︠a︡ "Okrŭzhen dŭrzhaven arkhiv"--I︠A︡mbol, History, Industries, Sources
Places: Bulgaria, I︠A︡mbolski okrŭg