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WikiPedia: Khok Pho Chai (huyện) http://www.amphoe.com/menu.php?mid=1&am=856&pv=5 http://www.khokphochaidoc.com //tools.wmflabs.org/geohack/geohack.php?language=v... http://www.manager.co.th/Politics/ViewNews.aspx?Ne... http://www.ratchakitcha.soc.go.th/DATA/PDF/2537/D/... http://www.ratchakitcha.soc.go.th/DATA/PDF/2550/A/... https://web.archive.org/web/20070929060754/http://...