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However, not all parties use the same grading.<ref>Crude oil grades, Crudemonitor.ca, web PDF file: [http://www.crudemonitor.ca/quickfacts/misc/grades.pdf CMonitor-Gr-PDF] {{webarchive |url=https://web.archive.org/web/20071008191730/http://www.crudemonitor.ca/quickfacts/misc/grades.pdf |date=October 8, 2007 }}</ref> The [[United States Geological Survey]] uses slightly different ranges.<ref>USGS FS2006-3133_508, web PDF file: [http://pubs.usgs.gov/fs/2006/3133/pdf/FS2006-3133_508.pdf USGS-508-PDF]</ref>
Crude oil with API gravity less than 10° is referred to as [[extra heavy oil]] or [[bitumen]]. Bitumen derived from [[oil sands]] deposits in Alberta, Canada, has an API gravity of around 8°. It can be diluted with lighter hydrocarbons to produce [[diluted bitumen]], which has an API gravity of less than 22.3°, or further "upgraded" to an API gravity of 31 to 33° as [[synthetic crude]].<ref>Canadian Centre for Energy Information. [http://www.centreforenergy.com/AboutEnergy/ONG/Oil/Overview.asp?page=2 "What is crude oil?"] {{Webarchive|url=https://web.archive.org/web/20140710020428/http://www.centreforenergy.com/AboutEnergy/ONG/Oil/Overview.asp?page=2 |date=2014-07-10 }}. Retrieved on: 2012-09-10.</ref>
==References==
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