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  1. By: Ershov, Nikolaĭ Grigorévich,
    Publication info: St. Petersburg, [s.n.], 1874
    Holding Institution: Smithsonian Libraries and Archives
  2. By: Ershov, Nikolaĭ Grigorévich, - Fedchenko, Aleksi͡eĭ Pavlovich,
    Publication info: S.-Peterburg, Imp. ob-vo li͡ubiteleĭ estestvoznanii͡a, 1874
    Holding Institution: Cornell University Library