Furness, Caroline E. <br/><br/>
An introduction to the study of variable stars 

 - Boston:  Hougton Mifflin  1915 
 - 317p. :   il; 23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astrofísica y Astronomía Descriptiva<br/>Estrellas variables<br/>variable stars