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by Boardman, Anthony E.; Greenberg, David H.; Vining, Aidan R.; et al.
by Livermore, Michael A.; Revesz, Richard L.
by Gordon, Lawrence; Loeb, Martin
by Marglin; Stephen A.
by Campbell; Harry
by Melese; Francois
by Congressional Research Service
by Center for Nation Reconstruction and Capacity Development
by Mishan; E. J.