Gonzalez Blackaller, Ciro E. <br/><br/>
El Siglo XXI 
/ Coautor Luis Guevara Ramirez 
 - 10a ed 
 - Mexico  : Herrero Hermanos  , 1973  , c1965. 
 - 295 p.  : il. retrs. maps. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Historia Universal
<br/><br/><label>Dewey Class. No.: </label>909 GON