Library of Congress Classification. Class Q. Science 
Subject Cataloging Division, Processing Services, Library of Congress  
 - 7th ed. 
 - Washington  : The Library of Congress  1989 
 - 736 p. 
<br/><br/> Kept up to date by the division's L.C. classification--additions and changes, and by two publications irregularly issued by Gale Research Company entitled: Library of Congress classification schedules--a cumulation of additions and changes, Class Q an d Library of Congress classification schedules combined with additions and changes. 
<br/><br/><label>ISBN: </label>0844406317 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Classification, Library of Congress--Periodicals<br/>Classification--Books--Science
<br/><br/><label>LC Class. No.: </label>Z696U5Q