This is why I popped the question. Physical copies of Campaign Book 2 are hard to get but Campaign Book 1 almost impossible unless you want to pay silly prices. So if they have reprinted book 2 I wonder why they're not doing Book 1.
@Brady Campaign Book 2 covers Normandy, Pacific and Poland. Whereas Campaign Book 1 covers also Normandy Overlord and Barbarossa and one more area as well