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Pradip Kumar Das,  An Introduction to the Concept of Environmental Audit: Indian Context.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. September 2017, vol. 129(9). 2172 - 2179[viewed 16 January 2018]. Available from: http://waset.org/publications/10007811.