%0 Journal Article %J Journal of Glaciology %D 2012 %T Using surface velocities to calculate ice thickness and bed topography: a case study at Columbia Glacier, Alaska, USA %A R  W McNabb %A Regine Hock %A Shad OʼNeel %A L  A Rasmussen %A Ahn, Y. %A M Braun %A H Conway %A Herreid, S. %A Ian Joughin %A W. Tad Pfeffer %A B  E Smith %A Martin Truffer %B Journal of Glaciology %V 58 %P 1151-1164 %G eng %N 212 %R 10.3189/2012JoG11J249 %0 Journal Article %J J. geophys. Res %D 2008 %T Continued evolution of Jakobshavn Isbrae following its rapid speedup %A Ian Joughin %A I M Howat %A Mark Fahnestock %A B  E Smith %A Krabill, W. %A Alley, R.B. %A Stern, H. %A Martin Truffer %B J. geophys. Res %V 113 %P F04006 %G eng %U http://www.agu.org/pubs/crossref/2008/2008JF001023.shtml