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	1.	No cover image available Junior high school science activities / by Ralph S. Vrana. by Vrana, Ralph S Publication details: West Nyack, New York : Parker Publishing Company, 1969 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (1)Call number: Q181.V7. Place hold
	2.	The mathematics laboratory a new teaching approach by Ralph S. Vrana. by Vrana, Ralph S Publication details: Englewood Cliffs, N.J. Prentice-Hall 1975 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (1)Call number: QA16.V72. Place hold

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