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Casio fx-991EX Classwiz for High School Students: Getling, David: 9781548247102: Amazon.com: Books
Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products
Casio FX-991SPX II Iberia- Calculadora científica con ilustración de Jess Wade en la tapa, Recomendada para el currículum español y portugués, 576 funciones, Solar y color gris /blanco : Casio: Amazon.es: Oficina