Browsing the shelves of a library can lead to serendipitous discoveries. But even with browsing it can help to have an idea of where particular subjects are located. The following lists will give the browsers among you a place to start.
Books on Russian as a language (philology, grammar, syntax, dictionaries) will be found at the north end of Level 2, between the call numbers PG2001 and PG2752, with most Russian-English dictionaries at PG2640.
Russian literature and the literature of the larger Russian-speaking world will be found between the call numbers PG2900 and PG3698, as follows:
Other countries in Europe PG3520
United States and Canada PG3525-PG3549
(You can explore this in much greater detail at http://www.loc.gov/aba/publications/FreeLCC/PB-PH-text.pdf between pages 209 and 214 for the language, and between pages 218 and 587 for the literature.)
The corresponding call numbers for the history and culture of these countries are found on the east side of Level 2:
Russia, the former Soviet Union, Russian Federation DK1-DK293 and DK510-DK651
Baltic States (treated collectively) DK502.3-DK502.75
(As above, you can explore this in much greater detail at http://www.loc.gov/aba/publications/FreeLCC/D-DR-text.pdf starting on page 474.)