International directory of suppliers and dealers of standard reference materials for measurement of metals and organics 
by Central Pollution Control Board 
 - Delhi  Central Pollution Control Board  1992 
 - 106p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Suppliers and dealers - Directories
<br/><br/><label>Dewey Class. No.: </label>T12053 In8