The Russian National Corpus covers the period from the first East Slavic manuscripts of the 11th century to the first decades of the 21st century. It represents both the language of previous eras and the modern Russian, in its sociolinguistic varieties: standard, substandard, colloquial, dialectal. The RNC includes, in particular, fiction texts (prose, poetry, drama, recorded movie dialogues) of a cultural as well as linguistic significance. But RNC is by no means only a corpus of belles-lettres or a model of exemplary language. The collection of the texts represents speech genres in all their diversity: memoirs, essays, journalism, popular science and academic literature, recordings of public speeches and private conversations, letters, messages, diaries, blogs private documents, amateur poetry, etc.
For more details, see Structure of the RNC.