.....propaganda maps I imagine. Starting with Map #204 titled "New Map of Europe" and dated 1933 to Map #272 titled "The End is Drawing Near" and dated 1945.
The Navy did a series of War Game attacks of the facilities at Pearl Harbor during the 1930s that showed how vulnerable the facilities were to an air attack. There is no doubt that the Japanese used this data in their planning. The same information could easily have been used in the development of the "How Japan Could Attack the US" map.