McGraw-Hill Companies. <br/><br/>
McGraw-Hill encyclopedia of science & technology/  Volume 6  gab-hys / 
produced by the McGraw-Hill Companies. 
 - 5th edition. 
 - New York :  McGraw-Hill,  c1982. 
 - 814 pages :  illustrations (some color), maps ;  29 cm 
<br/><br/> Includes index.