Bray, R. J. and Loughhead, R. E. <br/><br/>
Sunspots 

 - New York  Dover Publications, Inc.  1964 
 - 303 
<br/><br/><label>ISBN: </label>048663731X 
<br/><br/><label>Publisher. No.: </label> Bangalore Book Buereau 
<br/><br/><label>Subjects--Personal Names: </label> Astronomy 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy