Dave Kopel's list of 10 best second amendment books
At the Volokh Conspiracy, Dave Kopel has a pdf link to his recent article on the ten key books on the right to arms. Disclosure of conflict: my now out-of-print "Origins of the Second Amendment" is on it. I see there's still used copies available via Amazon, if anyone wants to try, and if I can find a publisher (the former one went out of business), I'd be game.
Update: reader Roger Thompson points out you can search libraries worldwide for books, using WorldCat, and not only find if a book is in them, but which location is closest to you.