For citations:

Vershinin E.V., Vizgalov G.P. CITY (OSTROG) FORTIFICATIONS OF SURGUT IN THE 17th CENTURY. Severny region: nauka, obrazovanie, kultura. 2020;(1 (45)):112-131. (In Russ.) https://doi.org/10.34822/2312-377X-2020-1-112-131