Major classification systems:   The Dewey Centennial 

 - Illinois:   University of Illinois,   1976 
 - xiv, 182p. 
 - Allerton park institute  Number 21 .
<br/><br/><label>ISBN: </label>0878450440 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library science
<br/><br/><label>Subjects--Index Terms: </label>Classification