Library as in paper library? You really lug paper around on your flightdecks still? No paper required at all anymore, we do get QRHs provided as convenience items though, but they are not required in paper form anymore. Not to mention FCOMs or AFMs, those are long gone.
Of course, the EFBs hold all the information as well, but they are pretty error-prone (running on windows xp) and might get dark very fast once their electrical supply is cut off.