Official Methods of Analysis   : of AOAC International 

 - 19 
 - Maryland :  AOAC ,         2012. 
<br/><br/><label>ISBN: </label>0935584838 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Fertilizers<br/> Hazardous substances<br/> Radioactivity<br/>Agricultural liming materials