TransliterationN.K. Kulman, professor. Metodika russkogo yazyka. S prilozheniem 6-i otdelnyh tablic risunkov i 1 cvetnoj tablicy v texte. Izdanie pyatoe. In Russian
In EnglishH.K. Kuhlman, Professor. Methods Russian language. C application 6-and separate tables drawings and 1 color tables in text. Edition fifth. In Russian, Petrograd
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