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Baris 52:
* [http://www.askoxford.com/results/?view=dict&freeluv Oxford Dictionary] dalam askoxford.com
* [http://gpih.ucdavis.edu/files/Clark_Jacks.pdf Baru Bara dan Revolusi Industri]
* [http://www.cfa-international.org/Trees%20and%20Woods%20by%20R%20White.doc Pohon dan Kayu: Antara Mitos dan Realita] {{Webarchive|url=https://web.archive.org/web/20081217185308/http://www.cfa-international.org/Trees%20and%20Woods%20by%20R%20White.doc |date=2008-12-17 }}, Peran Penting Hutan dan Kayu dalam Era Besi
* [http://www.ethanolrfa.org/industry/statistics/#E Statistik industrial: Produksi Etanol Tahunan di Seluruh Dunia per Negara]
* [http://news.bbc.co.uk/2/hi/science/nature/5353118.stm Bahan Bakar Bio Melihat ke Depan]
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