The problem with maps in history books is not the size of the screen on your Sony or K1. But the size of the map in the eBook. I've borrowed from the library one of Winston Churchill's WWII eBooks from the library in Mobipocket format and found the graphics too small to be of any use. So if I need to have the graphics visible to understand something, I'm screwed as they are too small and fuzzy to see well enough. And the problem would be that on the DX, these poor graphics would be even smaller and harder to see even still.
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