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APA Citation
Unknown (2003). Humic substances : nature's most versatile materials. Place of publication not identified : Taylor & Francis. http://access.bl.uk/ark:/81055/vdc_100062792859.0x000001
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Unknown (2003). Humic substances : nature's most versatile materials. Place of publication not identified : Taylor & Francis. http://access.bl.uk/ark:/81055/vdc_100062792859.0x000001