A Source book in astronomy and astrophysics, 1900-1975 / 
Ed. by Kenneth R. Lang, Owen Gingerich. 
 - Cambridge, Mass. :  Harvard University Press,  1979. 
 - xx, 922 p. :  ill. ;  29 cm. 
 - Source books in the history of the sciences .
<br/><br/>Includes bibliogr. references and indexes. 
<br/><br/><label>ISBN: </label>0674822005 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy--Addresses, essays, lectures.<br/>Astrophysics--Addresses, essays, lectures.