This is totally fascinating. GoDCer, and early contributor, John sent along an awesome site, which is a gold mine for old maps. This is one of our early favorites.
It is a map from 1935, plotting all the residences housing a juvenile delinquent, according to the Juvenile Court of the District of Columbia.
![1935 map of D.C. juvenile delinquents](https://ghostsofdc.org/wp-content/uploads/sites/7/2013/01/9087528.jpg)