00655naa#a2200181#i#450# EN\INFRA-M\bibl\49851 20240811051009.7 2306-1731 20220425b2022####ek#y0engy0150####ca RU On the Development of a Project for a Unified Concept of Teaching the History of the Russian Cossacks in Educational Institutions Journal article Moscow INFRA-M Academic Publishing LLC. 2022 3 с. Journal article local Демография. Социология. Статистика. 31 Kolesnikova M. E. Shapovalov V. A. naukaru.ru