I'm a graphic designer, and one of my clients has asked me to make a map of all the bookstores her company owns. All the stores are in New England. She wants interstates and connecting roads on the map as well. Are there EPS map files, or any other sort of downloadable map, that I could use for this? I'd like something a little better or higher resolution than the likes of Mapquest. And if it's at all possible, I'd like it to be in vector format. Is there anything like this out there? I can't seem to find it.