Study of circulation control systems 
/ American Library Association, 1961 
 - Chicago:   American Library Association,   1961 
 - 138p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library science
<br/><br/><label>Subjects--Index Terms: </label>Circulation system 
<br/><br/><label>Universal Decimal Class. No.: </label>D 025.6  / K1