Qanats, Karez and Foggaras
Paper about the irrigation channels of many desertic regions: Arabia, North Africa, Iran etc.
These channels can have many names: qanats, khettara, aflaj etc.
The document containts many black and white pictures and tables.
NB: The internet link on the RERO catalogue refers to Vaud catalogue, which offers the possibility to command the review number that containts this article.