International patent classification 
/ WIPO 
 - Geneva:   WIPO,   1994 
 - 6th ed. .
<br/><br/>Vol. 1 (Section A: Human necessities); ISBN: 92-805-0791-5; 163p. 
<br/><br/><label>ISBN: </label>92-805-0791-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library science
<br/><br/><label>Subjects--Index Terms: </label>Patent classification 
<br/><br/><label>Universal Decimal Class. No.: </label>D 025.4PATENt N9