00438nam a2200133 a 450000500170000000800410001710000550005824500610011326000420017430000320021665000180024865000270026685200110029320190520021440.0080327s19uu    xx            00    eng d10aPhilippine Institute of Volcanology and Seismology10aOperation Mayon :ba contingency plan for Mayon Volcano.0 aQuezon City :bPHIVOLCS Press,c1990.  a38 p. : ill., maps (1 col.)  aMayon (Mount)  aVolcanoesxPhilippines  7OLOPSC