INTERNATIONAL ASTRONOMICAL UNION SYMPOSIUM (5th <br/><br/>
"Comparison of the large-scale structure of the galactic system with that of other stellar systems. Proceedings of the IAU symposium No. 5, Dublin, September 2, 1955" 

 - Cambridge  Cambridge University Press  1958 
 - Hbk v p. + 72 
 - Mezzanine Floor .