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The Fundamental Digital Library of Russian Literature and Folklore is an incredibly rich and valuable digital resource, particularly as it hosts many academic redactions of classic works by Russian writers. A good substitute when you don't have the PSS on hand.
The Russian National Library maintains this excellent resource, listing sites of access for digitized journals and newspapers across the internet. Organized chronologically, thematically, geographically, and linguistically, this is an essential checkpoint if you're seeking a specific title.
Formerly known as ViFaOst, this German academic web portal provides often full-text access to a variety of resources on Eastern Europe, including library catalogs, bibliographies, and article databases.
Begun in 1997 as the major digitization project at the Bibliothèque Nationale de France, Gallica includes full-text of over 100,000 volumes and 300,000 images covering the Middle Ages to the beginning of the twentieth century, with an emphasis on nineteenth-century material. Residing in Gallica are dictionaries and encyclopedias, journals, manuscripts, recordings and images.
Digital collections created through a British Library-funded grant program that sends researchers to "endangered" research collections for preservation work. Many collections from Russia and Eastern Europe are included.