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'''PPT''' is an abbreviation for Parts Per Thousand. It is generally used as a unit to indicate [[salinity]].<ref>USGS</ref>
'''PPT''' is an abbreviation for Parts Per Thousand. It is generally used as a unit to indicate [[salinity]].<ref>http://www.nwrc.usgs.gov/fringe/glossary.html</ref>
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==References==
==References==