The list of 13 current root servers
The map of 13 current root servers
The WIA map (February 1998) is partly outdated.
The official ICANN documents include the correct one, for example: http://www.icann.org/correspondence/roberts-testimony-14feb01.htm (Testimony of Michael M. Roberts Before U.S. Senate Committee on Commerce, Science, and Transportation, Subcommittee on Communications).
There is no much difference in geography between the two constellations (www.wia.org and Mike Roberts document), only names are updated (no more reference to NSI-NSF etc).
According to Mike Roberts document:
ROOT-SERVERS name org city type a NSI Herndon, VA, US com b USC-ISI Marina del Rey, CA, US edu c PSInet Herndon, VA, US com d U of Maryland College Park, MD, US edu e NASA Mt View, CA, US usg f Internet Software C. Palo Alto, CA, US com g DISA Vienna, VA, US usg h ARL Aberdeen, MD, US usg i NORDUnet Stockholm, SE int j NSI (TBD) Herndon, VA, US (com) k RIPE London, UK int l ICANN Marina del Rey, CA, US org m WIDE Tokyo, JP edu
IAB Technical Comment on the Unique DNS Root