A. Belova O, P. Shchetinina N. The formation of the elements of school health supervision in the Ryazan province in the period from 1864 to 1890. HOM [Internet]. 2019 Feb. 28 [cited 2025 Sep. 17];6(1). Available from: http://www.historymedjournal.com/index.php/medicine/article/view/234