National Library of Latvia

The National Library of Latvia (NLL) (Latvian: Latvijas Nacionālā bibliotēka (LNB)) is the legal deposit library for Latvia. It holds 4.1 million books and other publications in more than 50 languages, covering all branches of knowledge and including special collections of rare books, manuscripts, periodicals, and more, and was founded in 1919.

More information on the Wikipedia page and the Lithuanian Wikipedia page