Title: Pervyĭ Vserossiĭskiĭ sʺezd Mari
Subjects: Mari (European people), Congresses, History, 880-05 Vserossiĭskiĭ sʺezd Mari (1st : 1917 : Birsk, Russia) http://id.loc.gov/authorities/names/no2021065471, 880-05 Vserossiĭskiĭ sʺezd Mari (1st : 1917 : Birsk, Russia)