Selected analytical methods approved and cited by the United States Environmental Protection Agency / 
Prepared and published by American Public Health Association, American Water Works Association, Water Pollution Control Federation 
 - 106 p. :  il. ;  22 cm. 
<br/><br/> Supplement to the fifteenth edition of Standard methods for examination of water and wastewater 
<br/><br/><label>Subjects--Topical Terms: </label><br/>AGUA--ANALISIS.
<br/><br/><label>Dewey Class. No.: </label>C 628.161  / A53s