I like Baker - get the 2nd edition. Actually, get any edition if you can afford it. Duffin too - very expensive.
I think there are places that do library "reprint" copies.
Wall - download that from the link Denise gave above for my website - I have a cleaner pdf where the diagrams are actually included that I need to upload... Email me if you want that.
Speaking of Carroll - he has a book from 1980 that I think it perhaps a good one to get - it's fairly modern and not all that expensive. Introduction to Photographic Theory: The Silver Halide Process.
I found a copy for $35 once. See here for some used copies:
And Denise - I think today it's ships passing in the rain for us!