In the "Advanced Search" screen of the library catalog search for dictionary in the subject field and choose a language. You can add a keyword if you want a specific type of dictionary like a medical dictionary, dictionary of musical terms, or agricultural dictionary among many examples.
National Bibliographies are a way to search through the publication output of various countries in this region. The University of Illinois has an excellent guide to navigating these, which is provided as the first link. The Russian National Bibliographies also include map, musical, and periodical publications.