Roberto H. Frank, Mcgraw Hill
$32.00
H. Gutierrez-r.de la Vara, Mcgraw Hill
$50.00
Gaceta Nº 36.607, Dabosan
$1.00
Jorge E. Burbano Ruiz, Mcgraw Hill
$35.00
Gabriel A. Cabrera Ibarra, Vadell Hermanos
$7.00
Margarita A. de Sanchez, Trillas
$10.00
Laura Hernandez Ramirez, Mc Graw Hill
$8.00