This was a 1947 map published by R. L. Polk, the directory publisher. I can't remember where I bought it; eBay or an antique store or a used book store. I suspect it was ripped off the inside cover of a city directory. I have it scanned into nine sections. I highlighted most of the industries but missed a few, and I no longer have the original scans without the highlighting, but I still have the original map.
Compared to most maps, it's difficult to read since it doesn't differentiate the the street types - a major street like Woodward is depicted the same as a short residential cul-de-sac. It does label a several of the major factories around town - more than most. Some have the building layout depicted like above, while others are just blank spots with the company name. I have some gas station maps from the 1950s which show the major factories, but not as many as this one. Search eBay and other online sites, or antique stores and used book stores for vintage maps from the era; some are more detailed than others.
I have a 1943 directory that has a list of significant industries in the city. Some day I might try to map them out either with Google Maps or GIS software. There were a few different directory or street guide publishers such as Federal and Polk and Sauer that made directories like this:
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