Sources , effects and risks of ionizing radiation 

 - New York  United Nation U S A       1988 
 - 647p.  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography - Environment
<br/><br/><label>Dewey Class. No.: </label>U:(G:55955), M8