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I 19. 42/ 4- 4 : 2006- 5218 : Interferograms showing land subsidence and uplift in Las Vegas Valley, Nevada, 1992-99 [electronic resource] / by Michael T. Pavelko, Jörn Hoffmann, and Nancy a. Damar ; prepared in cooperation with the Nevada Department of Conservation and Natural Resources--Division of Water Resources and the Las Vegas Valley Water District.