bank notes from the past

I found these old bank notes during my last trip to the Philippines. Apparently, during the 1940s during the Philippine-American war and WWII, the government authorized certain regions to print their own "emergency" money. During these years of war, it was difficult for different regions to communicate with one another.

I'm fascinated by the way these look, how hastily and crudely printed. I can't help but imagine how difficult and uncertain life must have been before the Philippines had full sovereignty. I wish I knew more about that period of time. This bank note directly below from 1942 has an illustration of Roosevelt (four years before the U.S. gave up control of the Philippines).