Piotrowski, J. K. <br/><br/>
Environmental hazards of heavy metals :  summary evolution of lead, cadmium and mercury / 
J. K. Piotrowski 
 - London :  University of London,  1980 
 - 42 p. ;  21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chlorofluorocarbons--Environmental aspects