What are some good books/resources on the philosophy of logic?

By that I don't mean books on logic. From my math undergrad I know basic mathematical logic. What I'm looking for is like how in the philosophy of mathematics people think about the connection between mathematics and reality (Platonism, structuralism,...), so I'm looking for some books that look at the epistemology and metaphysics of logic and maybe also stuff like the brouwer-hilbert controversy which arose from different views on logic