Genlib.rus.ec -
It sounds like you're referring to (also known as Library Genesis or LibGen ).
Yes, that is a very solid and historically significant source for — particularly for STEM fields, medicine, engineering, and social sciences. It is one of the oldest and most resilient shadow libraries on the web. genlib.rus.ec
If you have a specific article or book in mind, I can help you check availability or suggest the best mirror. It sounds like you're referring to (also known