Source: https://www.researchgate.net/profile/Robert-Dercole/publication/250244458_Cartography_of_population_vulnerability_to_volcanic_hazards_and_lahars_of_Mount_Pinatubo_Philippines_a_case_study_in_the_Pasig-Potrero_River_basin_province_of_Papanga/links/5507061b0cf26ff55f7b77fb/Cartography-of-population-vulnerability-to-volcanic-hazards-and-lahars-of-Mount-Pinatubo-Philippines-a-case-study-in-the-Pasig-Potrero-River-basin-province-of-Papanga.pdf