O. A. Belova and N. P. Shchetinina, “The formation of the elements of school health supervision in the Ryazan province in the period from 1864 to 1890”, HOM, vol. 6, no. 1, Feb. 2019, Accessed: Sep. 27, 2024. [Online]. Available: https://historymedjournal.com/HOM/index.php/medicine/article/view/234