Jack Holt's Science paper
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John W. Holt,
Ali Safaeinili,
Jeffrey J. Plaut,
James W. Head,
Roger J. Phillips,
Roberto Seu,
Scott D. Kempf,
Prateek Choudhary,
Duncan A. Young,
Nathaniel E. Putzig,
Daniela Biccari (2008),
Radar Sounding Evidence for Buried Glaciers in the Southern
Mid-Latitudes of Mars, Science, Vol. 322, no. 5905, pp. 125-1238. Full
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