http://www.amazon.com/Computability-Logic-George-S-Boolos/dp...
Another very good book on nuts and bolts proofs in both propositional and predicate logic is Beginning Logic by E. J. Lemmon.
http://www.amazon.com/Beginning-Logic-E-J-Lemmon/dp/09151445...
And a great collection of primary texts covering the history of modern logic is From Frege to Godel..., edited by Jean van Heijenoort.
http://www.amazon.com/Frege-Godel-Mathematical-1879-1931-Sci...
For the history of logic, Jean van Heijenoort's[2] annotated anthology, From Frege to Gödel[3] is fascinating.
And, BTW, I think your hunch (about Whig history) is correct.
[1]: http://www.turing.org.uk/publications/ct70.pdf
[2]: https://en.wikipedia.org/wiki/Jean_van_Heijenoort
[3]: https://www.amazon.com/Frege-Godel-Mathematical-1879-1931-Sc...