What are some good introductory books on Galois connections? I have read Galois Theory from Emil Artin, Algebra from Saunder Mac Lane, and I'm starting Serge Lang.
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Steven Roman's book Field Theory treats the Galois Theory part of his book using Galois connections. I don't have the book but I had browsed through it one time when I was looking for a different book in my university library, and I have to say that it seemed pretty good.
In particular, take a look at chapter 6, where he develops some theory about Galois connections and applies it to study the Galois correspondence.