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WikiPedia: Parts-per_notation http://archive.iupap.org/commissions/interunion/iu... https://web.archive.org/web/20170815113700/http://... https://web.archive.org/web/20140310054340/http://... http://www.bipm.org/utils/common/pdf/CCU16.pdf https://www.nist.gov/ http://www.bipm.org/en/home/ https://wpsites.ucalgary.ca/chem-textbook/chapter-... https://cfpub.epa.gov/ncer_abstracts/index.cfm/fus... http://www.bipm.org/en/publications/si-brochure/se... https://web.viu.ca/krogh/chem311/Units%20of%20Conc...