These are kind of interesting. They're part of the Perry-Castañeda online map collection, and what I've linked to are 1:1250 maps of Japanese cities circa 1946. That's down close enough that large buildings such as Sugamo Prison (the current site of Sunshine City) are actually shown with a detailed footprint. You can find it here, a bit left of center:
http://www.lib.utexas.edu/maps/ams/japa ... 645-08.jpg
Here's the index of all the Tokyo maps:
http://www.lib.utexas.edu/maps/ams/japa ... tokyo.html
By the way, the grey hatched areas are those destroyed by wartime bombing. Check out Kawasaki or Omori to see just how extensive this could be.
Here's the full index of city maps. It's pretty complete, even Kawagoe is there:
http://www.lib.utexas.edu/maps/ams/japan_city_plans/
