Search Results       Your search for [author]Petalio, Helen B. returned 1 record.           A climatological frequency of tropical cyclones towards Kalayaan Islands Group. by Petalio, Helen B.; Quezon City: TMRDO, PAGASA, 1991. Subject: Climatological frequency of tropical cyclones -- 1991 -- Quezon City; Meteorology.          Add to Book Cart Relevance: 25.48%