1992. National Imagery and Mapping Agency (now National Geospatial-Intelligence Agency). This datalayer is a polygon coverage representing landcover features located throughout DCW (Digital Chart of the World) geographic coverage as of ... National Imagery and Mapping Agency.
    
  
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      2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile includes name attributes for major polar glaciers and more recently de-glaciated areas and does not include scale rank attri... North American Cartographic Information Society.
    
  
    
      2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts major polar glaciers and more recently de-glaciated areas. Includes name attributes for major polar glaciers, but do... North American Cartographic Information Society.
    
  
    
      2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile includes name attributes for major polar glaciers and more recently de-glaciated areas and does not include scale rank attri... North American Cartographic Information Society.