Author: Russia) Regionalʹnai︠a︡ nauchnai︠a︡ konferent︠s︡ii︠a︡ posvi︠a︡shchennai︠a︡ 150-letii︠u︡ so dni︠a︡ rozhdenii︠a︡ Spiridona Drozhzhina (1998 Tverʹ