GEMS/Water operational guide / 
WHO collaborating centre for surface and ground wats quality national water research Institure. edited by Martine Allard. 
 - 3rd ed. 
 - Burlington, Ont :  The WHO Collaborating Centre,  1992. 
 - iv. :  ill. ;  30 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/> Open access. 
<br/><br/><label>LCCN: </label>93982184  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality--Measurement.<br/>Water quality monitoring stations.