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	1.	Challenge of the universe by Anderson, Norman D Allen Hynek, J Series: Vistas of science ; 4 Material type: Text; Format: print regular print ; Audience: General; Publication details: Washington : National science teachers association, 1962 Availability: No items available. Add to cart (remove)
	2.	Challenge of the universe by Anderson, Norman D Allen Hynek, J Series: Vistas of science ; 4 Material type: Text; Format: print regular print ; Audience: General; Publication details: Washington : National science teachers association, 1962 Availability: Items available for loan: Biblioteca Pública de la UNLP (1). Place hold Add to cart (remove)

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