Digital Chart of the World (DCW) for GMT

 DCW-GMT is an enhancement to the original 1:1,000,000 scale vector basemap
 of the world available from the Princeton University Digital Map and
 Geospatial Information Center and from GeoCommunity at
 http://data.geocomm.com/readme/dcw/dcw.html.
 This data is for use by GMT, the Generic Mapping Tools.