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WikiPedia: Cao_nguyên_Hoàng_Thổ http://english.peopledaily.com.cn/200603/11/eng200... http://greenleapforward.com/2009/02/24/soils-and-s... http://hopeinachangingclimate.org //tools.wmflabs.org/geohack/geohack.php?language=v... http://web.worldbank.org/WBSITE/EXTERNAL/EXTABOUTU... http://www.megalithic.co.uk/article.php?sid=18006