Aquatic vegetation and its use and control / 
edited by D.S. Mitchell. 
 - 2 microfiches :  negative ;  11 x 15 cm. 
<br/><br/> 'A contribution to the International Hydrological Decade'.  Fiche header: 84M0242 UNESCO. 
<br/><br/><label>ISBN: </label>9231010824 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aquatic weeds.<br/>Aquatic weeds--Control.<br/>Aquatic plants--Economic aspects.