1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.
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1985. This polygon shapefile contains ice observations in the Arctic region for February 13, 1985. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1985. This polygon shapefile contains ice observations in the Arctic region for February 18, 1985. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1994. This polygon shapefile contains ice observations in the Arctic region for May 16, 1994. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).
1993. This polygon shapefile contains ice observations in the Arctic region for November 22, 1993. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1991. This polygon shapefile contains ice observations in the Arctic region for April 2, 1991. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
1992. This polygon shapefile contains ice observations in the Arctic region for February 10, 1992. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1995. This polygon shapefile contains ice observations in the Arctic region for March 20, 1995. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1993. This polygon shapefile contains ice observations in the Arctic region for January 25, 1993. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1996. This polygon shapefile contains ice observations in the Arctic region for May 13, 1996. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).