2018 – BIOGAS DIRECTORY 2018 | Fifth Edition
The Asia Palm Oil Magazine Vol 7 No. 2, Jul-Sept 2018 Edition
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2017 – BIOGAS DIRECTORY 2017 | Fourth Edition
2016 – BIOGAS DIRECTORY 2016 | Third Edition
2015 – BIOGAS DIRECTORY 2015 – Second Edition
2014 – BIOGAS DIRECTORY 2014 | First Edition