Campbell, Leon,  1881-1951 <br/><br/>
The story of variable stars / 
by Leon Campbell and Luigi G. Jacchia 
 - Philadelphia :  The Blakiston company,  1941 
 - v, 226 p. ;  22 cm. 
 - The Harvard books on astronomy, ed. by Harlow Shapley and B. J. Bok .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Variable stars