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E. Oliver and R. W. Fairbridge, Van Nostrand Reinhold Company, New York, .
* Stadler, S. J (1987) 'Aridity Indexes', article in The Encyclopedia of Climatology, p. 102-107, Edited by J. E. Oliver and R. W. Fairbridge, Van Nostrand Reinhold Company, New York, .
* , 2009, Strategic Foresight Group

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