Methods used in the USSR for establishing biologically safe levels of toxic substances  
/ WHO 
 - Geneva:   WHO,   1975 
 - 171p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biology 
<br/><br/><label>Subjects--Index Terms: </label>Safe  
<br/><br/><label>Universal Decimal Class. No.: </label>614.65:545.9(47+57)  / L5