If there's an entry for it in the lore library, you should be able to pick it up somewhere. If it was quest-related, there shoild be another copy placed somewhere that is still accessible, such as outside the dungeon, by the quest giver, or by the quest turn-in. Any book that doesn't have a way to pick it up after the quest is bugged, and should be reported as such.drakhan2002_ESO wrote: »Some yes. For example when you complete the main quest line, especially when you go after Sia, the Torture Technique books will appear outside the Harborage if you did not pick them up inside the quest.
Some of the FG quests work the same way. You will find the missed books in the FG associated with that progression stage of the FG questline.
However, I would imagine that some of the books would be locked behind questwalls, if you didn't pick it up during the quest.
LoreBooks add-onCan't answer the question however, when I read my 2,500th book, a message came up and said,
"Wow, you really wanted to read 2,500 books!"
I thought it was funny. Flashed to quick for a screenshot.