A Source book in astronomy and astrophysics, 1900-1975 / 
edited by Kenneth R. Lang and Owen Gingerich. 
 - Cambridge, Mass. :  Harvard University Press,  1979. 
 - Source books in the history of the sciences .
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/><label>ISBN: </label>0674822005 
<br/><br/><label>LCCN: </label>78009463 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy.<br/>Astrophysics.
<br/><br/><label>LC Class. No.: </label>QB51  / .S67 
<br/><br/><label>Dewey Class. No.: </label>520/.8