I bought a second wizard school on sale and was able to upgrade it to level four with existing spell books. According to the info part in the upgrade area of the school, I should be able to get the books from the library, but neither my libraries nor Old Thomas's (which I recall also used to drop them) is dropping any books at all, and haven't for some time. I haven't seen the "can't hold anymore..." notice in a long time.
Also, my level four wizard school is only dropping 9 energy, not ten. I thought it was supposed to be 10 and upgrading reduced collection time.
What's up?