50 Cosas Sencillas para Salvar a la Tierra 
/ Earth Works Group 
 - Mexico  : Diana  , 1994  , c1989. 
 - 149p. pb. 2ej. 
<br/><br/><label>ISBN: </label>968-13-2153-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Proteccion Ambiental
<br/><br/><label>Dewey Class. No.: </label>341.762 EAR