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