M. Velhagen - E. Calderon, Trillas
$6.00
Gaceta No. 39.027, Njr
$1.00
H. Gutierrez-r.de la Vara, Mcgraw Hill
$50.00
Imelda Arana Saenz, Magisterio
$7.00
Jesus R. Torres Pertuz, Paredes
$9.26
Oscar Pierre Tapia, Pierre Tapia
$6.00
Mcphee, Mcgrawhill
$72.60
Jorge E. Burbano Ruiz, Mcgraw Hill
$35.00