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	1.	Crop response to the supply of macronutrients / H. van Keulen & H. D. J. van Heemst by Keulen, H. Van Heemst, H. D. J. van Series: Agricultural Research Reports ; 916 Publication details: Wageningen, Netherlands : Center for Agricultural Pub. and Documentation, 1982 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (1)Call number: SB185.K48. Place hold
	2.	The greenhouse effect and primary productivity in European agro-ecosystems : proceedings ... Wageningen 5-10 April 1990 / editors J. Goudriaan, H. van Keulen and H. H. van Laar by International Workshop on Primary Productivity of European Agriculture and Greenhouse Effect (1990 : Wageningen) Goudriaan, J 1893- Keulen, H. Van Laar, H. H. van Publication details: Wageningen : Pudoc, 1990 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (1)Call number: GBQC912.3.I57 1990. Place hold

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