\begin{thebibliography}{1}

\bibitem{ircache}
``A distributed testbed for national information provisioning.''
\newblock \path|http://ircache.nlanr.net|.

\bibitem{nanog}
k~claffy, A.~Rousskov, and D.~Wessels, ``Nanog presentation,'' Fabruary 1998.
\newblock \path|http://www.nlanr.net/~rousskov/research/nanog|.

\bibitem{squid}
``Squid internet object cache.''
\newblock \path|http://squid.nlanr.net|.

\bibitem{rfc-2068}
R.~Fielding, J.~Getys, J.~Mogul, H.~Frystyk, and T.~Berners-Lee, ``Hypertext
  transfer protocol -- http/1.1,'' {\em Network Working Group RFC 2068},
  January 1997.
\newblock \path|http://ds.internic.net/rfc/rfc2068.txt|.

\bibitem{ip2ll}
``Ip address to latitude and longitude.''
\newblock \path||http://cello.cs.uiuc.edu/cgi-bin/slamm/ip2ll/.

\bibitem{rfc-1876}
C.~Davis, P.~Vixie, T.~Goodwin, and I.~Dickinson, ``A means for expressing
  location information in the domain name system,'' {\em Network Working Group
  RFC 1876}, January 1996.
\newblock \path|http://ds.internic.net/rfc/rfc1876.txt|.

\bibitem{planet-multicast}
T.~Munzner, E.~Hoffman, K.~claffy, and B.~Fenner, ``Visualizing the global
  topology of the mbone,'' in {\em Proceedings of the {IEEE} Symposium on
  Information Visualization}, 1996.

\bibitem{richard}
R.~A. Becker, S.~G. Erick, and A.~R. Wilks, ``Visualizing network data,'' {\em
  {IEEE} Transactions on Visualization and Computer Graphics}, vol.~1, March
  1995.

\end{thebibliography}
