Merrill, William Stetson  <br/><br/>
Code for classifiers 

 - 1 ed. 
 - Chicago :   American Library Association,   1939, 1954 
 - xi, 177 p 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bibliotecologia
<br/><br/><label>Dewey Class. No.: </label>025.4000 M55