Take close look at the map, in the lower left corner. If you follow Market Street to the lower left corner, near a large number 11 is “Kate Street”. This street no longer exists, and it leads to an area labeled “Hospital Area”; this is now Duboce Park and three cul-de-sac blocks of homes, one of which is now Potomac St. It’s fun to see the map agree with what I read in the book by Harry Nimmo referenced in the article.
I am entertaining a fantasy of creating a Google Map of the area and replacing the tiles with the old map. Hopefully I’ll actually get to that.
UPDATE: I’ve checked the Google Maps API, and it seems what I need to do is a “Custom Map Type”, which The Google deems an “Advanced Topic.” They put this in red; I may be in over my head!