1993. This polygon shapefile contains ice observations in the Arctic region for February 15, 1993. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
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1995. Projection: WGS72 Mercator Projection; Series: Defense Mapping Agency Nautical Charts. National Geospatial-Intelligence Agency.
1995. This polygon shapefile contains ice observations in the Arctic region for March 13, 1995. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
1991. This polygon shapefile contains ice observations in the Arctic region for February 11, 1991. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1994. This polygon shapefile contains ice observations in the Arctic region for December 5, 1994. This layer is part of the Arctic Climate System (ACSYS)... Arctic Climate System (ACSYS).
1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, and 2001. National Atlas of the United States, Environmental Systems Research Institute (Redlands, Calif.), and Geological Survey (U.S.). This line shapefile represents the federally owned land features (for example, national parkways and wild and scenic rivers) of the United States. ... Environmental Systems Research Institute (Redlands, Calif.).
1998. This polygon shapefile contains ice observations in the Arctic region for December 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 27, 1998. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1997. This polygon shapefile contains ice observations in the Arctic region for April 7, 1997. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
2008. World Wildlife Fund. This river network (stream lines) map for Europe is derived from the flow direction map for Europe. The flow accumulation map for Europe is used fo... Geological Survey (U.S.).