Publications of the national research council of Canada  
/ The National Research Council  
 - Ottawa:   The National Research Council,   1948  
 - 27p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research 
<br/><br/><label>Universal Decimal Class. No.: </label>R 017.5/6(71)  / 90455