1970 Blue-Collar Rest Room Sketch

Found this sketch in a book I bought at a resale a while back. I consider it folk-art. Some hard-working assembly-line guy took the time to sketch the inside of the rest room at the plant.

Click on image for bigger version, or even higher-resolution scan here:
http://i87.photobucket.com/albums/k153/urania235/1970PlantRestRoom1100.jpg