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	1.		Synthetic rubber technology by Penn, W S Material type: Text; Format: print ; Literary form: Not fiction Publication details: London: Maclaren & Sons, Ltd., 1960 Availability: Items available for reference: National Science Library: Not for loan (1)Call number: 678.6 K0.1. Add to cart (remove)
	2.		Plastics-in-building handbook by Penn, W S Material type: Text; Format: print ; Literary form: Not fiction Publication details: London: Maclaren & Sons, Ltd., 1964 Availability: Items available for loan: National Science Library (1)Call number: R 691.175(02) K4. Place hold Add to cart (remove)

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