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http://www.nis.gov.kh/nis/uploadFile/pdf/CensusResult98.pdf
3. FAOSTAT Population data (2016)
http://www.fao.org/faostat/en/#data/QC
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5. Laos PDR (1995) A country study, Library of Congress, Area Handbook Series, Washington, DC.
https://www.loc.gov/resource/frdcstdy.laoscountrystudy00sava_0