Classification key 

 - Washington, D. C. :  The Department,  (s.a.) 
 - Pag. var. 
<br/><br/><label>LCCN: </label>42050 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clasificación de libros.
<br/><br/><label>Dewey Class. No.: </label>025.4  / E8