Feeding the mapextents placenames to Google gave some amazing results!
Guess what You get for results when searching for the keywords “Philadelphia Camden Wilmington Cherry Hill Levittown ….” etc ? You find Geographic info as in maps.
Try this PDF finder: http://bbox.me/bbox.html?id=143
If You press the Google.me button it displays links to pdf-maps of Philly.
Try to zoom or move to another place. For instance in Lund, Sweden:
(Note You must sometimes allow popups in Your browser for this to work)