land.xdr, water.xdr
  land.xdr and water.xdr contain land and water outlines from the
  xearth-1.0 data set by Kirk Lauritz Johnson <tuna@cag.lcs.mit.edu>.

  Values were taken from mapdata.c of the xearth-1.0 source distribution
  and converted to latitudes and longitudes by Gordon Carrie (gaz@tkgeomap.org).
  Some shapes were divided into smaller shapes to make them easier for tkgeomap
  to read them.

river.xdr
  river.xdr contains river outlines created with the pscoast command in
  GMT (gmt.soest.hawaii.edu) by P. Wessel and W. H. F. Smith.

format
  The *.xdr files are xdr streams with the following format:
  An xdr string descriptor
  An xdr integer record giving the number of points in the first line
  Lat lon values for the first line as xdr float records
  An xdr integer record giving the number of points in the second line
  Lat lon values for the second line as xdr float records
  (Likewise until no more lines)

Cities.tcl
  Cities.tcl contains locations of major cities obtained from Factmonster:
  http://www.factmonster.com/ipka/A0001769.html and
  http://www.factmonster.com/ipka/A0001796.html
  and a couple more for New Zealand courtesy of Philip at Q-Solutions

