1991. This polygon shapefile contains ice observations in the Arctic region for May 21, 1991. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).
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1998. This polygon shapefile contains ice observations in the Arctic region for November 2, 1998. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1998. This polygon shapefile contains ice observations in the Arctic region for November 3, 1998. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1998. This polygon shapefile contains ice observations in the Arctic region for October 30, 1998. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1981. This polygon shapefile contains ice observations in the Arctic region for December 29, 1981. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1986. This polygon shapefile contains ice observations in the Arctic region for March 24, 1986. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1919. Rand McNally and Company. Includes "President Wilson's peace conditions" and "Allies' principal terms of armistice."; Includes proposed new boundaries and final battle lines... Rand McNally (Chicago).
1990. This polygon shapefile contains ice observations in the Arctic region for August 13, 1990. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
Bar scale on map given in "English Miles.". Simson & Co. Ltd.
1998. This polygon shapefile contains ice observations in the Arctic region for August 14, 1998. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).