Title: 150 let shkole vydai︠u︡shchegosi︠a︡ peterburgskogo pedagoga-prosvetiteli︠a︡ K.I. Mai︠a︡
Subjects: Congresses, History, Intellectual life
Places: Saint Petersburg (Russia)
People: Nicholas Roerich (1874-1947), Karl Ivanovich Maĭ (1820-1895)