Hydrologic drought of water year 2006 compared with four major drought periods of the 20th century in Oklahoma [electronic resource] / by Robert L. Tortorelli ; prepared in cooperation with the Oklahoma Water Resources Board.
Electronic reproduction. Oklahoma City : Oklahoma Dept. of Libraries, 2009. 56 p. : digital, PDF file. System requirements: Adobe Acrobat Reader. Mode of access: World Wide Web.
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