Keith Challis, Gary Priestnall, Adam Gardner, Julian Henderson, Sarah O'Hara, Corona Remotely-Sensed Imagery in Dryland Archaeology: The Islamic City of al-Raqqa, Syria, Journal of Field Archaeology, Vol. 29, No. 1/2 (Spring, 2002 - Summer, 2004), pp. 139-153
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Challis et al. (2002) studied this question.
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