1987, 1988, 1989, 1990, 1991, 1992, and 1993. National Atlas of the United States. The Satellite View of the Conterminous United States, with Shaded Relief map layer is a 200-meter-resolution simulated-natural-color image of the U... National Atlas of the United States.
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1989. This polygon shapefile contains ice observations in the Arctic region for April 10, 1989. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1989. This polygon shapefile contains ice observations in the Arctic region for April 17, 1989. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1989. This polygon shapefile contains ice observations in the Arctic region for April 24, 1989. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1989. This polygon shapefile contains ice observations in the Arctic region for April 3, 1989. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
1989. This polygon shapefile contains ice observations in the Arctic region for December 11, 1989. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1989. This polygon shapefile contains ice observations in the Arctic region for December 18, 1989. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1989. This polygon shapefile contains ice observations in the Arctic region for December 27, 1989. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1989. This polygon shapefile contains ice observations in the Arctic region for December 4, 1989. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1989. This polygon shapefile contains ice observations in the Arctic region for February 13, 1989. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).