Guevarra, Maydeen D. <br/><br/>
The reaction of the stomatal apparatus of Rhoeo Discolor (L'Herit) hance as an indicator of air pollution  [manuscript] / 
Maydeen D. Guevarra. 
 - Magalang, Pampanga :  Pampanga Agricultural College,  2004. 
 - 89 page :  illustrations ;  28 cm.