Hubble, Edwin. <br/><br/>
The observational approach to cosmology / 
Edwin Hubble. 
 - London :  Clarendon Press,   1937. 
 - ix, 68 p. :  ill. ;  23 cm. 
<br/><br/> Includes index. 
<br/><br/>338  338 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cosmology.
<br/><br/><label>Dewey Class. No.: </label>523.1 / H862o