Downloaded September 2012 from
http://nsidc.org/data/nsidc-0082.html
ftp://sidads.colorado.edu/pub/DATASETS/RAMP/DEM_V2/200M/ARCINFO/

Downloaded file:
demwgs200_v2.tar.gz
Original image file name:
wgs84_200m.*

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http://nsidc.org/about/use_copyright.html

This page is also available offline in this folder, but note that terms might have changed since data download.