Chbouki, Nabil. 1992. ?Spatio-Temporal Characteristics Of Drought As Inferred From Tree-Ring Data In Morocco?. Geosciences. Geosciences. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=747430801&sid=6&Fmt=2&clientId=43922&RQT=309&VName=PQD.