2010. U.S. Census Bureau. Geography Division. This polygon data layer represents the 2010 TIGER/Line Census combined statistical areas for the United States. The TIGER/Line Files are shapefiles...
    
  
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      2007. National Center for Ecological Analysis and Synthesis. This raster layer represents global commercial shipping activity including location and travel routes. Commercial shipping activity can lead to shi... Science.
    
  
    
      1786. Rumsey, David, 1944- and Pownall, Thomas. This layer is a georeferenced image of a map of North America orignally created by T. Pownall in 1786. The original map appears in "A general atlas... Cartography Associates.
    
  
    
      1787. Rumsey, David, 1944- and Boulton, S. This layer is a georeferenced image of a map of Africa originally created by S. Boulton in 1787. The original map appears in 'A general atlas, desc... Cartography Associates.
    
  
    
      1787. Rumsey, David, 1944- and Kitchin, Thomas. This layer is a georeferenced image of a map of Europe created in 1787. The original map appears in 'A general atlas, describing the whole universe... Cartography Associates.
    
  
    
      1812. Rumsey, David, 1944- and Pinkerton, John, 1758-1826. This layer is a georeferenced image of a map of the world, originally created by J. Pinkerton in 1812. The original map appears in "A modern atlas,... Cartography Associates.
    
  
    
      2013. Rawson, Peg and United States. Bureau of Transportation Statistics. This polygon shapefile contains United States congressional district boundaries for 2013-2015. Congressional Districts are the 435 areas from which... United States. Bureau of Transportation Statistics.
    
  
    
      2000. University of Minnesota. Institute on the Environment. This raster dataset represents the average yield for cotton crops in tons per hectare. Croplands cover ~15 million km2 of the planet and provide th... University of Minnesota. Institute on the Environment.
    
  
    
      2000. University of Minnesota. Institute on the Environment. This raster dataset represents the agricultural census data quality for cotton crop yields. Data quality categories include (0= missing, 0.25= coun... University of Minnesota. Institute on the Environment.
    
  
    
      2000. University of Minnesota. Institute on the Environment. This raster dataset represents the agricultural census data quality for harvested areas of cotton crops. Data quality categories include (0= missin... University of Minnesota. Institute on the Environment.