Voprosy istorii dorevoli︠u︡t︠s︡ionnoĭ Chuvashii

by Nikolaĭ Egorovich Egorov, V. A. Prokhorova, Chuvashskai︠a︡ A.S.S.R. (R.S.F.S.R.). Nauchno-issledovatelʹskiĭ institut i︠a︡zyka, literatury, istorii i ėkonomiki