Customs Laboratory Guide. 
At head of title :   Nomenclature and Classification 

 - Brussels:  World Customs Organization,  2003. 
 - (loose-leaf) ;  31cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Customs Laboratory Operations--Chemical Analysis--Tariff Classification<br/>Customs Administration --Law and legislation
<br/><br/><label>Dewey Class. No.: </label>542.3 WCO