Atwater, Mary <br/><br/>
Organismos Simples y Virus./ 
Atwater, Mary, Prentice Baptiste, Lucy Daniel 
 - New York  Macmillan/McGraw-Hill  1993 
 - 93p.  20*25 cm 
<br/><br/><label>ISBN: </label>0-02-275289-7 
<br/><br/><label>Universal Decimal Class. No.: </label>502