Word-Nerds come find your fodder.: We all knew Mencken was a master of wit, but little did we know that his mastery of words could also be introspective to the language itself. As a linguistics major, I found this tome extremely interesting. If you want meticulous detail on the historyu and the divergence from the British English, snap this book up. If you're still not satisfied, hunt around for the appedices he wrote later in his life.

Still indispensable introduction to American English.