Regional Workgroup Polygons, U.S. and Mexico, 2020, U.S. Environmental Protection Agency

This polygon layer represents the four U.S.-Mexico Border Program regional workgroup geographic area. These workgroups were created according to the geographic...本多边形图层（polygon layer）表征美墨边境计划（U.S.-Mexico Border Program）下辖的四个区域工作组的地理范围。上述工作组系依据地理……设立而成。