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http://alamendah.org/2014/08/01/kerusakan-lingkungan-hidup-di-indonesia-dan-penyebabnya/http://alamendah.org/2014/04/17/ozon-dan-lapisan-ozon/

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http://alamendah.org/peraturan-hukum/keputusan-menteri/

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http://2.bp.blogspot.com/-UjzFu42xzuM/Uv-Da3RVmlI/AAAAAAAAB88/IU9Yl_5WFJU/s1600/h.PNGhttp://4.bp.blogspot.com/-I9lXxwsl_Vc/Uv-DaLRnA_I/AAAAAAAAB80/lipsQLWXo40/s1600/g.gif

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http://ridwanrudy.blogspot.co.id/2012/10/alat-pelindung-diri.htmlhttps://mysafetyshoes.wordpress.com/2011/10/27/tujuan-manfaat-jenis-dan-kegunaan-dari-alat-perlindungan-diri-apd/https://mysafetyshoes.wordpress.com/2011/10/27/tujuan-manfaat-jenis-dan-kegunaan-dari-alat-perlindungan-diri-apd/http://rimantho.blogspot.co.id/2015/03/alat-pelindung-diri-dalam-k3.html