Observatorio astronomico nacional 
Universidad Nacional Autonoma De Mexico                      
 - Mexico  Universidad Nacional Autonoma De Mexico  1969 
 - [various pagings.] 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>Eclipses-Sun<br/>Total eclipse
<br/><br/><label>Universal Decimal Class. No.: </label>523.947:520.86  / UNI