Payne-Gaposchkin, Cecilia. <br/><br/>
Variable stars and the sources of stellar energy / 
Cecilia Payne-Gaposchkin. 
 - U.S.A. :  American Philosophical Society,  1943. 
 - 10 p. ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy
<br/><br/><label>LC Class. No.: </label>SPE-B 06118