Campbell , Leon . <br/><br/>
The Story of Variable Stars /  Textual Documents 
Leon Campbell & Luigi Jacchia. 
 - 1st ed. / 
 - Toronto :  The Blakiston Co. ,  C1941. 
 - 225p. ;  22cm. 
<br/><br/>Index 
<br/><br/><label>Subjects--Index Terms: </label>Stars G-Mathematics 
<br/><br/><label>Dewey Class. No.: </label>523.84  / C 153 St