Masers and optical pumping 

 - New York       Amercian          1965 
 - 107p.  cm. 
<br/><br/><label>Standard No.: </label>27609 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Optical<br/>Physics
<br/><br/><label>Dewey Class. No.: </label>C5:72z7, K5