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	1.	The soil nitrogen index and its calibration with crop performance to improve fertilizer efficiency on Arable soils J. B. D. Robinson by Robinson, J. B. D [author.] Series: Special publication ; no.1 Publication details: Slough, England Commonwealth Agricultural Bureaux 1975 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (1)Call number: S592.6 .N5R6. Place hold
	2.	An Annotated bibliography of colour illustrated mineral deficiency symptoms in tropical crops / by J.B.D. Robinson by Robinson, J. B. D Series: Technical communication / Commonwealth Bureau of Horticulture and Plantation Crops ; no. 34 \| Technical communication (Commonwealth Bureau of Horticulture and Plantation Crops). no. 34 Publication details: Farnham Royal : Commonwealth Agricultural Bureaux, 1974 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (2)Call number: SB41.R624 zz 00008045729, ... Place hold

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