V.N. Tatishchev: "...Have a strong caution In Chyorny Yar, the Yenotaevо and Kizlyar fortressesto". Construction and reconstruction of the fortifications in the Lower Volga and the Northern Caucasus in the 1740s
The article highlights the problems of fortification barrier facilities' erection in the Astrakhan province in the first half of the XVIII century.