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Hijmans, Robert J. This polygon shapefile contains the boundary of United States (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 United States (adm1). Level 1 divisions include states and federal dist... University of California, Berkeley. Museum of Vertebrate Zoology and International Rice Research Institute.
Hijmans, Robert J. This polygon shapefile contains the second-level administrative divisions of United States (adm2). Level 2 divisions include counties and cities. T... University of California, Berkeley. Museum of Vertebrate Zoology and International Rice Research Institute.