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These two volumes present the results of fieldwork conducted by Tertia Barnett from 2004–2009 in the Wādi al-Ajāl (Libya). The first volume provides a general synthesis in three sections: 1) presentation of Saharan rock art in general; history of discoveries and research; climate, environment and human activities in the Holocene Sahara; state of knowledge on the chronology. 2) Presentation of the method adopted for collecting data; results of the surveys; subjects and themes observed. 3)doi:10.15184/aqy.2020.202 fatcat:6lsrj3feazdf7agztynum2zsa4