WHYMAP and the World Map of Transboundary Aquifer Systems at the scale of 1 : 50 000 000 (Special Edition for the 4th World Water Forum, Mexico City, March 2006)
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Willi Struckmeier, Andrea Richts. "WHYMAP and the World Map of Transboundary Aquifer Systems at the scale of 1 : 50 000 000 (Special Edition for the 4th World Water Forum, Mexico City, March 2006)." Episodes 29.4 (2006) 274-278