Gull, Erhard <br/><br/>
Perspectiva 

 - 2a. ed. 
 - Buenos Aires :   Revert,  1965  
<br/><br/><label>Standard No.: </label>DAQ-M4790 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PERSPECTIVA
<br/><br/><label>Universal Decimal Class. No.: </label>515.6