This data set is coming from the following instutions:

This data is in the public domain, provided custodians are acknowledged, 
please refer to the source of the data for distribution instructions

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ETOPO2 Global 2-Minute Gridded Elevation Data

Data: Land Elevations and Ocean Bathymetry

For full information about ETOPO2, including searching, extraction,
display capabilities, please see

  http://www.ngdc.noaa.gov/mgg/fliers/01mgg04.html

Technical contact:

Dr. Peter W. Sloss
(303) 497-6119
peter.w.sloss@noaa.gov

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Countries boudaries
Extracted from FreeGIS Worlddata

These sample geodata have been extracted from VMAP Level0 R3. To avoid the
raster grids the original data has been processed by grass by reclassifying an
dissolving all polygons. The result is polygon data set with boundaries of most
of the countries of the world.

The data has been modified to be in the [0 360] range and fit ETOPO2

License
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The FreeGIS worlddata are licensed under the terms of the GNU General Public
License (GPL). This will perhaps be changed in future versions when a better
licence which is better suitable for free geodata becomes available.

Copyright (c) 2004 by Intevation GmbH, Authors: Silke Reimer

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World Cities

http://www.mappinghacks.com/data/
The cities file has been modified to fit [0 360] and some capitals have been
added.