Lewis, John L. (John Logan)  <br/><br/>
Radioactivity / 
John L. Lewis and E. J. Wenham illustrated by T. H. McArthur. 
 - London:  Longman,  1970. 
 - 64 p. :   ill. ;   22 cm. 
 - Longman physics topics. .
<br/><br/><label>ISBN: </label>0582322065 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radioactivity--Experiments.<br/>Radioactivity--Measurement.