1966. This line shapefile contains ice observations in the Arctic region for January 21, 1966. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
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1966. This line shapefile contains ice observations in the Arctic region for January 14, 1966. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
1966. This line shapefile contains ice observations in the Arctic region for January 7, 1966. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).
1979. 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 ozone (O3) ... United States. Bureau of Transportation Statistics.
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 ozone (O3)1... United States. Bureau of Transportation Statistics.
1966. This line shapefile contains ice observations in the Arctic region for January 28, 1966. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
1966. This line shapefile contains ice observations in the Arctic region for February 4, 1966. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
1985. This polygon shapefile contains ice observations in the Arctic region for September 16, 1985. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1966. This line shapefile contains ice observations in the Arctic region for April 29, 1966. This layer is part of the Arctic Climate System (ACSYS) Hist... Arctic Climate System (ACSYS).
1966. This line shapefile contains ice observations in the Arctic region for May 20, 1966. This layer is part of the Arctic Climate System (ACSYS) Histor... Arctic Climate System (ACSYS).