Kopytov S, Demakov D. NATURAL SURROUNDINGS OF MEDIEVAL SOCIETIES IN THE UPPER KAMA VALLEY. ВПФИЦ [Internet]. 2017 Jan. 20 [cited 2026 May 15];(3):6-14. Available from: https://journal-dev.icmm.ru/index.php/pscj/article/view/PSCJ2016n3p2