"Administrativnye granit︠s︡y dany na 3.I.58 g." [Administrative borders as of January 3 1958.]
In 1990, the Gorky Oblast (Горьковская область, Gorʹkovskai︠a︡ oblastʹ ) was renamed to the Nizhny Novgorod Oblast (Нижегородская область, Nizhegorodskai︠a︡ oblastʹ).