Russian language

Gavrilov, Boris Gavrilovich (1854-1885). Works of folk literature, rituals and beliefs of the Votyaks of the Kazan and Vyatka provinces. Kazan: Orthodox Missionary Society, 1880.

РГБ

The doublet fund of the National Security Service.
A primer for the children of the children. Kazan: the edition of the Orthodox missionary society, 1898.

РГИА

  Luppov, Pavel Nikolaevich (1867-1949).     About the first Novye translations of the sources of Christian enlightenment.
Kazan: The Center. type., 1905.

РГБ

Russian, Peter Mitrofanovich (1898-1942). Russian-to-Russian dictionary. Izhevsk: Udkniga, 1928.

ГПИБ