00000caa a22000003i 4500 UP-1685594773861817564 Buklod 20110224081136.0 j|||||||||||||| | ta 110224s xx d r |||| u| (iLib)UPBAG-00008225187 Cordillera Periodicals Pooten, Patrick. Ozone layer protection campaign Patrick Pooten. p. 11 ill. Ozone layer. Bantayan : Environment Alert Jl-S 1989 v.2, no.1. UPBAG UPBAG-MAIN CORDILLERA PERIODICALS Analytics