Library of Congress  Subject Cataloging Division <br/><br/>
Classification :  Class T : Technology. 

 - 4th ed. 
 - Washington :  Govt. print. off,  1948 (Reprinted 1953). 
 - 325 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Classification--Books--Technology<br/>Classification, Library of Congress<br/>Classification--Books--General works