This data set includes subsurface radar profiles that were recorded between core sites during the November-December seasons for 1999-2002. Data were collected using an ice-penetrating radar to survey the ice sheet. Ice thickness data are available for a portion of the West Antarctic Ice Sheet. This study is part of the U.S. participation in the International Trans-Antarctic Scientific Expedition (US ITASE). Elevation data are available in Excel and Microsoft Access database format via FTP. Radar data in SEGY format are available by special request on DVD by contacting NSIDC User Services.