This service was a gateway between the Geographic Name Server at martini.eecs.umich.edu and the World Wide Web, with links to maps from Xerox.
This message is now returned by the server at the University of Michigan:
The geographic name server is gone. The machine that ran it (a very old Vax) failed, and we do not have source code to port it to a new machine. If you really want it, the (badly outdated) data is available for anonymous ftp on "ftp.eecs.umich.edu" in the "/pub/eecs/geo" directory.
So, if you're reading this, you have two choices: