I've found a whole lot of libraries to 'borrow' from, but I'm not sure which books are worth stea..borrowing. Where can I find a list of books that increase skills when they are read? Preferably with their locations.
If the value is about 2 to 15 gold, ignore it.
If it is worth 50-70 gold, then read it - it's a skill book.
This does not take into account a few books that give you quests.
For books in you inventory (or laying face up):
Books that increase a skill have that skill's icon on the cover
The full list of books including their locations can be found on the Skyrim wiki
Below is an except: