- N.Berdyayev A notice
about Bogdanov's book "Poznaniye s istoricheskoj tochki zreniya "
N.Berdyayev A notice about Bogdanov's book "Cognition from a historical
point of view"
- À. Bogdanov K voprosu
o noveishikh filosofskikh techeniyakh (Response to N.Berdyayev)
À. Bogdanov About new philosophical trends (Response to N.Berdyayev)