Longtime resident Dan Pagath shared a really cool 1930s WPA map of Pittsburgh with us.  The map shows active and inactive oil and gas wells and coal contours, coal seams (mined and not mined), coal shafts and openings.

The image for the whole map is too big to post here; this is a cropped section, showing what was then called Herron Hill.  The streets aren’t marked on the map, but the S-curve of Herron Avenue is unmistakeable.  There were coal mines all over the hillside above the neighborhood — they’re probably still there, sealed off.

The map legends are included, and you can click on the image to see it larger.

(Image from the PHCA archive — please ask permission before reposting)