1999. This polygon shapefile contains ice observations in the Arctic region for November 19, 1999. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
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1999. This polygon shapefile contains ice observations in the Arctic region for November 22, 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 November 23, 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 November 24, 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 November 25, 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 November 26, 1999. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
2001. Eastern Energy Resource Surveys Team (Geological Survey). This polygon shapefile shows the coal fields of Alaska and the conterminous United States. Most of the material for the conterminous United States ... National Atlas of the United States.
1990. This polygon shapefile contains ice observations in the Arctic region for January 15, 1990. 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 December 9, 1998. 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 6, 1996. This layer is part of the Arctic Climate System (ACSYS) Hist... Arctic Climate System (ACSYS).