I.A.U. Symposium No.15, 1961 <br/><br/>
Problems of extra-galactic research   
ed. by G.C. McVittie 
 - New york  Macmillan Company  1962 
 - xii, 450p. 
 - International astronomical union symposium No.15 .
<br/><br/><label>Dewey Class. No.: </label>521.582  / N62