Gaceta N. 40.639, Njr
$2.00
Sue Kay - Vaughan Jones, Macmillan
$1.00
Gaceta Nº 40.440, la Piedra
$1.40
Gaceta Nº 38.433, Njr
$1.26
Juan R. Cuadrado Roura, Mcgraw Hill
$30.00
M. Morris Mano - Ch. Kime, Prentice Hall
$22.00
Gaceta 37.378, Rgrafica
$0.20
Maricarmen Paz Miranda, Atenea
$7.00