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- Language: Русский
- Year: 1930

- Author: Перельман Я.И.
- Language: Русский
- Year: 1932

- Author: Никольский А.М.
- Language: Русский
- Year: 1927

- Author: Перельман Я.И.
- Language: Русский
- Year: 1930

- Author: К.Е. Вейглин
- Language: Русский
- Year: 1930

- Author: Лебедев В.И.
- Language: Русский
- Year: 1930

- Author: Перельман Я.И.
- Language: Русский
- Year: 1928

- Author: Перельман Я.И.
- Language: Русский
- Year: 1928

- Author: Перельман Я.И.
- Language: Русский
- Year: 1933

- Author: Перельман Я.И.
- Language: Русский
- Year: 1929