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		No cover image available Approaches de la science du développement socio-économique / Edited by Peter Lengyel. by Lengyel, Peter, edit \| UNESCO. Material type: Text; Literary form: Not fiction Publication details: Paris : UNESCO, 1971Availability: Items available for reference: Disponible (Préstamo en sala) (1) . Collection(s): UNESCO Call number: 338 (100) =40 APP..
		No cover image available Approaches to the science of socio-economic development / Edited by Peter Lengyel. by Lengyel, Peter, edit \| UNESCO. Material type: Text; Literary form: Not fiction Publication details: Paris : UNESCO, 1971Availability: Items available for reference: Disponible (Préstamo en sala) (1) . Collection(s): UNESCO Call number: 338 (100) =20 APP..