Trager, William, 1910- <br/><br/>
Symbiosis/ 
William Trager 
 - New York  Van Nostrand Reinhold Co  1970 
 - ix, 100 p. :   ill. ;   19 cm. 
<br/><br/>Bibliography: p. 95-97. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Symbiosis