Procedures used at the national bureau of standards to determine selected trace elements in biological and botanical materials  
/ U. S. Department of Commerce 
 - Washington, D. C.:   U. S. Department of Commerce,   1977 
 - x, 287p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Universal Decimal Class. No.: </label>577.17   / L7