National union catalog :    register of additional records. 

 - Washington :    Library of Congerss,    1977. 
 - v. ;    23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> National union catalogs.<br/> Printed card files.
<br/><br/><label>Dewey Class. No.: </label>021.64 NAT