Yes. 100% yes. Obviously and clearly, yes. Universities have huge libraries and archives. It used to be a point of pride how big their libraries and archives were. University libraries bound and collated their periodicals. They converted them to microfiche to save space, but the integrity was paramount.

Yes. Libraries should be able to back-reference every citation that is included in every paper that they publish, and so should the journals. That is paramount to the scientific method. Anything that you have not verified yourself should have a clear citation that you're able to prove.