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		Enseñanza Abierta : Sistemas de enseñanza postsecundaria a distancia / Norman Mackenzie, Richmond Postgate, John Scupham. by MacKenzie, Norman, 1921-2013 Postgate, Cichmond [coaut.] Scupham, John [coaut.] UNESCO Material type: Text; Literary form: Not fiction Publication details: Madrid, Esp. : UNESCO, 1979 Availability: Items available for loan: Bib. Gregorio Torres Quintero (1). Items available for reference: Bib. Gregorio Torres Quintero: Disponible (Préstamo en sala) (2)Collection, call number: UNESCO 374 (100) MAC, ... Place hold
		Études ouvertes : Systems d´instruction postsecondaire á distance/ Norman Mackenzie, Richmond Postgate, John Scupham. by MacKenzie, Norman, 1921-2013 Postgate, Cichmond [coaut.] Scupham, John [coaut.] UNESCO Material type: Text; Literary form: Not fiction Publication details: Paris : UNESCO, 1977 Availability: Items available for reference: Bib. Gregorio Torres Quintero: Disponible (Préstamo en sala) (1)Collection, call number: UNESCO 374 (100) =40 MAC.
		Open learning : Systems and problems in post-secondary education / Norman Mackenzie, Richmond Postgate, John Scupham. by MacKenzie, Norman, 1921-2013 Postgate, Cichmond [coaut.] Scupham, John [coaut.] UNESCO Material type: Text; Literary form: Not fiction Publication details: Madrid, Esp. : UNESCO, 1975 Availability: Items available for reference: Bib. Gregorio Torres Quintero: Disponible (Préstamo en sala) (1)Collection, call number: UNESCO 374 (100) =20 MAC. Not available: Bib. Gregorio Torres Quintero: UNESCO (1).