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		El desarrollo del pensamiento conceptual en la escuela primaria / Peter Langford ; tr. Isidro Arias. by Langford, Peter Material type: Text; Format: print ; Literary form: Not fiction Publication details: México : Paidós, 1989 Availability: Items available for loan: Bib. Gregorio Torres Quintero (3)Collection, call number: Colección General LB1555 L3.38, ... Place hold
		El desarrollo del pensamiento conceptual en la escuela secundaria / Peter Langford ; tr. Silvia Hovath. by Langford, Peter Material type: Text; Format: print ; Literary form: Not fiction Publication details: Barcelona, Esp. : Ministerio de Educación y Ciencia : Paidós, 1990 Availability: Items available for loan: Bib. Gregorio Torres Quintero (8)Collection, call number: Colección General LB1063 L3.28, ... Place hold

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