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	1.	Dictionary of environmental science and technology Andrew Porteous by Porteous, Andrew Edition: 2nd ed. Publication details: Chichester: John Wiley & Sons, 1996 Availability: Items available for reference: Central Library Allama Iqbal Open University Islamabad: Not for loan (1)Call number: 628.3 OPE. Lists: Reference Collection. Add to cart (remove)
	2.	No cover image available No cover image available Maintaining the environment : prepared by andrew porteous for the technology foundation course team The Open University by Porteous, Andrew The Open University Publication details: Keynes: The Open University Press, 1972 Availability: Items available for loan: Central Library Allama Iqbal Open University Islamabad (1)Call number: 600 OPM. Place hold Add to cart (remove)
	3.	Refuse derived fuels Andrew Porteous by Porteous, Andrew Material type: Text Publication details: London: Applied Science, 1981 Availability: Items available for loan: Central Library Allama Iqbal Open University Islamabad (1)Call number: 662.6 POR. Place hold Add to cart (remove)

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