map showing mid-twentieth century manufacturing sites

[tfrodent]

I’m seeking help from some of the experts who people this site, in finding a good mid-twentieth century map of Detroit that identifies manufacturing sites throughout the city. I know what I want exists. Here is an image posted by Mikem from a March, 2005 post[[http://atdetroit.net/forum/messages/6790/39227.html), from a map he states is from 1947:



I would dearly like to see this entire map—even better a similar map from 3-5 years later. Can anyone [[maybe Mikem?) tell me the source? I have a suspicion that it may be a Sanborn map, but don’t know. Can anyone help, or suggest a source for such a mid-century map of this beautiful quality? There are many excellent and detailed posts [[particularly old atdetroit.net, circa 2005-6) on individual factory buildings, but it’s hard to get a clear mid-century perspective without a whole map like this.