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WikiPedia: Chlorofluorocarbon http://www.plascon.com.au/destruction-of-ozone-dep... http://www.mksinst.com/techinfo/GasConversionTable... http://www.refrigerants.com/msds/r12.pdf http://www.american.edu/projects/mandala/TED/cfctr... http://adsabs.harvard.edu/abs/1968HWM....17..335M http://books.nap.edu/books/0309057825/html/63.html http://books.nap.edu/openbook.php?record_id=9042&p... http://www.epa.gov/ozone/geninfo/numbers.html http://www.epa.gov/ozone/ods.html http://www.epa.gov/ozone/ods2.html