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1998. This polygon shapefile contains ice observations in the Arctic region for September 28, 1998. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1998. This polygon shapefile contains ice observations in the Arctic region for September 29, 1998. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1998. This polygon shapefile contains ice observations in the Arctic region for September 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 September 30, 1998. This layer is part of the Arctic Climate System (ACSY... Arctic Climate System (ACSYS).
1998. This polygon shapefile contains ice observations in the Arctic region for September 4, 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 September 7, 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 September 8, 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 September 9, 1998. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, and 2014. Applied Science Associates. This point shapefile represents boat launching ramps in the northeastern United States. Boat launches are state, municipal, local, or privately own... Northeast Ocean Data.
1966, 1967, 1968, 1969, 1970, 1971, 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, and 1998. Patuxent Wildlife Research Center. This line shapefile portrays the current routes used for conducting Breeding Bird Surveys in the lower 48 States. This layer is part of the 1997-20... National Atlas of the United States.