Leonid Borisovich Weinberg.Traces of the Khazar nationality within the Voronezh province.

Leonid Borisovich Weinberg.Traces of the Khazar nationality within the Voronezh province.- 1891. -Agreement No. 24 of 02/12/2016 category 9 manuscript of the works of members of the Russian Geographical Society and separate documents on the Voronezh province, case 64..Electronic copy source: PB