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	1.	Advances in Agronomy Sparks, Donald L. Series: . 111 Publication details: Boston Elsevier 2011 Availability: Items available for loan: University of Embu (2)Call number: S 405 .A24 2011, ... Found in Open Library: Place hold Add to cart (remove)
	2.	Envoronmental Soil Chemistry Sparks, Donald L. by Sparks, Donald L Publication details: Amsterdam Academic Press 2003 Availability: Items available for loan: University of Embu (2)Call number: S 592.5 .S6 2003, ... Found in Open Library: Place hold Add to cart (remove)