Vietnam - The World Factbook
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The World Factbook - Google Books
Mainland Southeast Asia - Wikipedia
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Southeast Asia - Wikiwand
CIA puts the world at your fingertips, Jack Schofield
The World Factbook (1990)/Cambodia - Wikisource, the free online
Vietnam: Jump To Navigation Jump To Search, PDF, North Vietnam
Measuring the effect of environmental education for sustainable development at elementary schools: A case study in Da Nang city, Vietnam - ScienceDirect