The Dewy Decimal Code for Magic is 793.8
Try searching with that, because library searches aren't always the best, especially when your subject is a commonly used adjective that shows up in titles.
I wasn't hardcore about magic back when I lived in Philly (because I was still a kid/early teen before I moved, and didn't know that most magic was possible without super fancy machines), but I just checked the online catalog of the (pretty small) local library from back there and found 5 or 6 books that actually seem useful (along with a Criss Angel Mindfreak book...). There are probably a lot more from the "big" library we got stuff from sometimes.
I'm assuming that if you go to library's near major cities, or areas that have been fully developed for a while, you are more likely to find magic related books. However, if you go to a developing or newer area (like the one I now live in), you're gonna probably find less stuff (there are literally 3 books about magic in my local library
system, all by the same author, and all about 20 pages long.)
I would recommenced picking up a book from Amazon. They are fairly cheap, and give you a lot of information. A great book is
"
The Royal Road to Card Magic" by Jean Hugard and Fredrick Braúe. It builds you up from the absolute basic shuffle, all the way up to advanced moves like the Pass, Changes, and Reverses. It is essentially 230 pages full of thoroughly explained slights and moves, followed by another 50 pages of great tricks and routines, along with some performance and ethic tips. Here is a link, in case you're interested:
https://www.amazon.com/gp/product/0...08434&linkId=1c696cc2b780a2f555e5f68b9298b478
Its only $3 on kindle, and only $10 on paperback.
Good Luck!