Problems of extra-galactic research 
edited by G. C. McVittie                                    
 - New York  Macmillan  1962 
 - xii, 450p. 
 - IAU Symposium; no. 15 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and Astrophysics Thesaurus<br/>Extragalactic objects<br/>Extragalactic radio sources
<br/><br/><label>Universal Decimal Class. No.: </label>082.2:52  / IAU-S15