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WikiPedia: Đèo_Chẹn //tools.wmflabs.org/geohack/geohack.php?language=v... //tools.wmflabs.org/geohack/geohack.php?language=v... //tools.wmflabs.org/geohack/geohack.php?language=v... http://www.baoxaydung.com.vn/news/vn/xa-hoi/son-la... http://bacyen.sonla.gov.vn/hbacyen/1304/31707/6167... https://www.flickr.com/photos/trungtk2004/28998192... https://www.google.com/maps/@21.182814,104.2281324... https://commons.wikimedia.org/wiki/Category:Mounta... https://thuvienphapluat.vn/van-ban/Xay-dung-Do-thi...