One of my bigger mysteries-An album I found in my great grandfathers dresser

Here are a few shots of the pages inside this book. It appears to be some vintage postcards that were easy to recognize, but then there are page after page of war shots. A few say ©P.E. Leeb which I can only assume was the photographer of some. Ive had the book for probably 5 years. I have looked through it a couple of times but Im always afraid Im going to mess them up further before I am able to solve the mystery. I scanned one picture I thought was cool of the girls with babies. It be easier if I would have found it prior to my great grandfather passing then he could have told me what the book was and what was what. Now I have to hope someone else can shed a little light.