Hari Perlindungan Lapisan Ozon Sedunia: Perbedaan antara revisi
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{{commons category|Ozone layer}}
* [http://www.uneptie.org/ozonaction/events/ozoneday/ UNEP DTIE OzonAction Branch: Ozone Day]
* [http://www.nrca.org/newscenter/Press_releases/Archive/1999/pr990908.htm September 16 is International Ozone Day (sic)] {{Webarchive|url=https://web.archive.org/web/20080919030030/http://www.nrca.org/newscenter/Press_releases/Archive/1999/pr990908.htm |date=2008-09-19 }}
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