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	1.	Food, climate and carbon dioxide : the global environment and world food production by Wittwer, Sylvan H Publication details: Boca Raton, Fla. : CRC Press, 1995 Availability: No items available.
	2.	The greenhouse effect / Sylvan H. Wittwer by Wittwer, Sylvan H Series: Carolina biology readers ; 163 Publication details: Carolina Biological Supply Co., Burlington, N.C. : Scientific Publications Division, 1988 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (1)Call number: GBQC912.3.W57. Place hold

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