McGraw Hill encyclopedia of science and technology:  vol.19 ULC-ZYT/ 
McGraw Hill 
 - 6th ed 
 - New Delhi:  McGraw Hill Book Company;  c1987. 
 - hbk, 648 p. 
<br/><br/><label>ISBN: </label>0070792925 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedia<br/>Science and technology
<br/><br/><label>Dewey Class. No.: </label>503.21  / MCG