Abstract: The article’s focus is on the transfer history of the princess Z. N. Yusupova’s archive, as well as on the most valuable part of the Yusupov book treasures, originally held in the “Arkhangelshoe” estate and then moved to the Rumyantsev Museum in 1919–1920. The research, based on the documents in the Rumyantsev Museum Archive (today – the Russian State Library Archive), provides insight into the unique circle of specialists-bibliographers in the Rumyantsev Museum who during the first post-Revolution years worked to rescue Russian archives and libraries. The minute study of the preservation history of the intellectual heritage of the princes Yusupovs leads to the necessity of bringing back to memory the unjustly forgotten figures in Russian bibliography: V. D. Golitsyn, V. O. Nilender, A. S. Petrovsky and others. Information regarding these people, who not only collected and preserved the archival and book treasures of Russia, but also multiplied them, can be drawn from sources that contain little known historical facts. A comparative analysis of all referenced sources allows to better understand how the post-Revolutionary “spirit of the time” and the genesis of the socio-cultural phenomenon of the “little person” of the Soviet epoch transformed from the pre-Revolutionary Russian intellectual.

Abstract: The article is devoted to the research of the reality of socio-cultural illusions undestood by the author as the 'reality of the virtual world'. The given analysis of the eality of the socio-cultural virtual world is based on the differentiation between a gnoseological definition of socio-cultural illusions viewed as usual misconceptions and their ontological status, i.e. the status of the human reality. Thus, the research subject is the illusions existing at the level of society and culture which the author distinguishes from individual psychological illusions that haven't become socially or culturall important. The methodological basis of research can be outlined as the synthesis of different achievements in the field of philosophical research of social and cultural illusions. The novelty of the article is caused by the fact that the author provides a clear definition of socio-cultural illusions in terms of their ontological status and tries to offer a substantiated classification of socio-cultural illusions. 
The conclusions of research involve performance conditions and stage-by-stage destruction of the reality of socio-cultural illusions, in other words, in fact, the conditions for socio-cultural illusions losing their ontological status.