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Hijmans, Robert J. This polygon shapefile contains the boundary of Guam (adm0). This layer is part of the Global Administrative Areas 2015 (v2.8) dataset. University of California, Berkeley. Museum of Vertebrate Zoology and International Rice Research Institute.
Hijmans, Robert J. This polygon shapefile contains the first-level administrative divisions of Guam (adm1). Level 1 divisions include municipalities. This layer is pa... University of California, Berkeley. Museum of Vertebrate Zoology and International Rice Research Institute.