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World English is an exciting new four-skills general English series which uses National Geographic content, images and video to teach the language that learners need to succeed in their daily lives. The series is built upon clear and practical learning goals which are presented and practiced through appropriate themes and topics. A competency-based series, World English uses real people, real places and real language to connect learners of English to the world.

Worldwide development of agriculture and industry creates burgeoning demands on natural resources. Management of the rivers and the surrounding landscape is one of the important tasks for today and for the foreseeable future. Lessons learned from centuries of management (and mismanagement) have been distilled into principles and practices which form the subject matter for this book. It provides both a global perspective and an entree to the special problems associated with management of transboundary rivers.

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