Vowels without stress in Russian

Bogoroditsky, V.Vowels without stress in the Russian language / [Soch.] V. Bogoroditsky.- [Kazan: B. and., 1880].-16 s .. -(Dep.- Ex.: Without Titus.l.and region..1. Russian language (collection).Electronic copy source: PBOriginal storage: St. Petersburg State University