McGraw-Hill encyclopedia of science and technology :  an international reference work in fifteen volumes including an index : Vol. 6 : Gab-Hys /  
Macgraw Hill Book Co. 
 - [4th ed.] 
 - New York :  McGraw-Hill,  [1977]. 
<br/><br/><label>Subjects--Index Terms: </label>მეცნიერება