Scientific and technical societies of the United States and Canada 
/ National Research Council, Canada 
 -  7th ed. 
 - Washington, D. C.,:   National Academy of Sciences,   1961 
 - 413p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Subjects--Index Terms: </label>Technology 
<br/><br/><label>Universal Decimal Class. No.: </label>061.22(71)+(73)  / K1