O'Connell, D. J. K., ed. <br/><br/>
Stellar populations:   proceedings of the Conference sponsored by t he Pontifical Academy of Science and the Vatican Observatory. May 20-28 , 1957 /  
Edited by D. J. K. O'Connell ... 
 - Amsterdam :   North Holland Publishing Company [for the] Vatican Ob servatory,   1958 
 - Lxv, 544 p. :    ill., tables, diagrs. ;    25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Milky way--Clusters------<br/>Stars --Clusters------
<br/><br/><label>Dewey Class. No.: </label>523.113 OCO