The development of the ancient irrigation system at Engaruka, northern Tanzania: physical and societal factors
WESTERBERG, LARS-OVE ; HOLMGREN, KARIN ; BÖRJESON, LOWE ; HÅKANSSON, N. THOMAS ; LAULUMAA, VESA ; RYNER, MARIA ; ÖBERG, HELENA
The Geographical journal, 2010-12, Vol.176 (4), p.304-318 [Periódico revisado por pares]Oxford, UK: Blackwell Publishing Ltd
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