En
RuСельскохозяйственная информация. Пропаганда достижений науки и передового опыта
Материалы по теме
On the dissemination of agricultural information through popular schools
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Ponomarev, Nikolay Viktorovich
On the dissemination of agricultural information through the medium of popular schools. St. Petersburg: type. V. Kirschbaum, 1900. |