2001. National Atlas of the United States, Environmental Systems Research Institute (Redlands, Calif.), and Geological Survey (U.S.). This polygon shapefile represents urban areas in the United States derived from the urban areas layer of the Digital Chart of the World (DCW). Data... Environmental Systems Research Institute (Redlands, Calif.).
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2001. Geological Survey (U.S.). This data set includes a selection of urban areas in the United States derived from the urban areas layer of the Digital Chart of the World (DCW). ... Geological Survey (U.S.).
1994. This polygon shapefile contains ice observations in the Arctic region for April 11, 1994. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for August 27, 1999. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for August 30, 1999. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for August 31, 1999. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for September 1, 1999. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for September 10, 1999. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for September 13, 1999. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for September 14, 1999. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).