Author Ефимов И. Е. Description Efimov, IE Scientific research work in Chuvashia / I.E. Efimov; Chuvash Research Institute. - Cheboksary: Chuvash state. publishing house, 1933. -76 p. : table .. - . Source of the electronic copy: PB Publisher Чувашское гос. изд-во Collections Chuvash Republic (Chuvashia) → Chuvash Republic (Chuvashia): pages of history → The people → Science and Education → Science
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