Miguel Del Cura, Paraninfo

$38.00

Victor Colina, Biosfera

$7.00

Frida Diaz Barriga Arceo, Mcgraw Hill

$30.00

Antonio Perez Esclarin, San Pablo

$5.00

$12.00

Antonio Perez Esclarin, San Pablo

$6.08

Prof. Ramon Grau, Ediciones Grau

$6.00

Jose Gregorio Bello P., Panapo

$6.00

Antonio Luis Cardenas, Dasa

$4.00

Dario Linares Hernandez, Dl Editoriales

$8.91

Antonio Perez Esclarin, San Pablo

$7.00

H. Reichmann, Thomson

$35.00

Norman E. Gronlund, Trillas

$23.00

Abel Cortese, Planeta

$25.00

Luis Quintana, Mcgraw Hill

$20.00