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	1.	No cover image available Philosophy of science: an introduction / Robert Ackermann. by Ackermann, Robert John, 1933- [author] Publication details: Pegasus : New York, 1970 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (1)Call number: Q175.A27. Place hold
	2.	No cover image available Theories of knowledge : a critical introduction / Robert Ackermann. by Ackermann, Robert John, 1933- Publication details: Bombay : Tata McGraw-Hill, 1965 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (4)Call number: BD161 .A35 1965, ... Place hold

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