Enlace original:
https://wedocs.unep.org//handle/20.500.11822/7663
United Nations Environment Programme
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[Transboundary Water Assessment Programme (TWAP) Vol. 6: Crosscutting Analysis - Transboundary Waters Systems: Status and Trends]
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Transboundary Water Assessment Programme (TWAP) Vol. 6: Crosscutting Analysis - Transboundary Waters Systems: Status and Trends