Mould, Richard F. <br/><br/>
A history of x-rays and radium with a chapter on radiationunits :  1895-1937 / 
by Richard F. Mould. 
 - [London] :  Pitman,  1976. 
 - 100 p. :  ill. 
<br/><br/><label>ISBN: </label>0617003556 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radium--History.<br/>X-rays--Equipment and supplies--History.