1966. This line shapefile contains ice observations in the Arctic region for April 1, 1966. This layer is part of the Arctic Climate System (ACSYS) Histo... Arctic Climate System (ACSYS).
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1966. This line shapefile contains ice observations in the Arctic region for April 8, 1966. This layer is part of the Arctic Climate System (ACSYS) Histo... Arctic Climate System (ACSYS).
1985. This polygon shapefile contains ice observations in the Arctic region for September 2, 1985. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1966. This line shapefile contains ice observations in the Arctic region for March 11, 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 March 4, 1966. This layer is part of the Arctic Climate System (ACSYS) Histo... Arctic Climate System (ACSYS).
1966. This line shapefile contains ice observations in the Arctic region for March 18, 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 March 25, 1966. This layer is part of the Arctic Climate System (ACSYS) Hist... Arctic Climate System (ACSYS).
2014. United States. National Geospatial-Intelligence Agency. UNCLASSIFED World Port Index Arctic coverage. Arctic coverage of the NGA World Port Index-Medium Harborsize. Data current as of 11 December 2014. T... United States. National Geospatial-Intelligence Agency.
1580. This line shapefile contains ice observations in the Arctic region for June 17, 1580. This layer is part of the Arctic Climate System (ACSYS) Histo... Arctic Climate System (ACSYS).
1990. This polygon shapefile contains ice observations in the Arctic region for June 5, 1990. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).