$6.07

$10.20

$10.44

Antonio Perez Esclarin, San Pablo

$6.00

Livian Navarro Caro, Panapo

$1.20

$14.40

A. Rubio Gil, Diaz de Santos

$33.60

Luis Quintana, Mcgraw Hill

$24.00

Prof. Ramon Grau, Ediciones Grau

$7.20

Norman E. Gronlund, Trillas

$34.91

Ana Ponce de Leon, Ccs

$14.40

$1.51

H. Reichmann, Thomson

$42.00

Frida Diaz Barriga Arceo, Mcgraw Hill

$36.00

Antonio Luis Cardenas, Dasa

$4.80