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WikiPedia: Mạch_nước http://www.mineralwater.vic.gov.au http://www.findaspring.com/ http://books.google.com/books?id=sjEoBmfUka0C&prin... http://pubs.er.usgs.gov/pubs/ofr/ofr03315 http://pubs.er.usgs.gov/usgspubs/ds/ds230 http://ga.water.usgs.gov/edu/watercyclesprings.htm... http://www.tfn.net/springs/Springbook/FirstMagnitu... http://www.srwmd.state.fl.us/index.aspx?NID=56 https://web.archive.org/web/20021121180111/http://...