Quote Originally Posted by Baselinepunk View Post
"This does not appear to be a technical/commercial map but a tourist map."

I concur with the above poster that this looks just like a Sanborn. DPL has on-site only access to them. Some universities offer Sanborn electronic access to their students through their libraries as well.

I should add that I believe that Sanborn maps are copyrighted; however, I don't know for sure.
It's not a Sanborn map. The numbers on the map reference individual buildings, not larger zones.