Saving the present for the future the state of the environment - Tapay, Nenita E.; Pacardo, Enrique P.; Briones, Nicomedes D.; Jimenez, Rosario D.; Gomez, Edgardo E.; Zamora, Prescillano M.; Fortes, Miguel D.; Zarafalla, Macrina T.; Feranil, Imelda Zosa (State of the nation reports / U.P. CIDS, 1992)