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1. Introducción a la ética / by Diego Pérez, Ismael. Publication: México : Fernandez, 1963 . 197p. ; 18 cm. Date: 1963 Availability: Items available: (1),

2. El Mundo de la ética by Diego Pérez, Ismael. Publication: México : Trillas, 1965 . 261 p. ; 22 cm. Date: 1965 Availability: Items available: (1),