Voprosy arkheologii i istorii Chuvashii

by Mikhail I︠A︡kovlevich Sirotkin, Vasiliĭ Dimitrievich Dimitriev, Chuvashskai︠a︡ A.S.S.R. (R.S.F.S.R.). Nauchno-issledovatelʹskiĭ institut i︠a︡zyka, literatury, istorii i ėkonomiki