: Ensure the download button specifically lists FB2 . This format is ideal for e-readers like Kindle (with conversion), PocketBook, or mobile apps like FBReader.
Avoid sites that ask for your or credit card details to "verify" a free download. Legitimate public domain libraries will never ask for this information for a classic book like What Is to Be Done? .
: While primarily English-focused, they have a growing Russian section. Search for "Chernyshevsky" to see available formats.
: One of the oldest and most reliable digital libraries in Russia. While the main page often hosts .txt files, many mirrors and associated links provide FB2 versions.