PNAS proceedings of the National Academy of Sciences of the United states of America  :  Special Astronomy Feature 

 - 40 p.,col.phot.,diagr. 
<br/><br/><label>ISBN: </label>0309065429 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astrophysics
<br/><br/><label>Dewey Class. No.: </label>A9P93f231