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by Atem de Carvalho, Rogerio; Estela, Jaime; Langer, Martin
by Bunker, Robert J.; Heal, Charles
by U.s. Joint Force Command
by United States Air Force
by National Aeronautics and Space Administration
by Doro-On; Anna M.
by Russell, Roberta S.; Taylor, Bernard W.
by Pollpeter, Kevin L.; Chase, Michael S.; Heginbotham, Eric
by United States General Accounting Office