I can only think of librarily and librarish. Can I use those? Are there other better alternatives?
The topic of this book isn't very "[...]". I don't think you should donate it.
"The topic of this book isn't very library friendly?"
Bibliothecal--(adj) Relating to a bibliotheca (library). CollinsDictionary.com
What about Libraic, or might that refer to the base word libra? (i.e., etymologically Latin 'libra' vs. 'liber')