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2005. Geological Survey (U.S.). This line shapefile represents railroads in the conterminous United States and Alaska at 1:2,000,000. This is a replacement for the December 1998 m... Geological Survey (U.S.).
2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This line shapefile represents roads in North America at 1:1,000,000 scale. The roads included in this layer are either those that connect major ce... Geological Survey (U.S.).
2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This polygon shapefile shows the approximate extent of marine areas in the Arctic covered by permanent polar ice. The data originated from the Cana... Geological Survey (U.S.).
2006. World Wildlife Fund. This river network (stream lines) map for South America is derived from the flow direction map for South America. The flow accumulation map for Sou... Geological Survey (U.S.).
2006. World Wildlife Fund. This river network (stream lines) map for South America is derived from the flow direction map for South America. The flow accumulation map for Sou... Geological Survey (U.S.).
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, 2001, 2002, 2003, 2004, and 2005. Geological Survey (U.S.). This polygon shapefile portrays the state boundaries of the United States, and the boundaries of Puerto Rico and the U.S. Virgin Islands. The map l... Geological Survey (U.S.).
2013. Geological Survey (U.S.). This point shapefile contains selected streamflow gaging stations of the United States, Puerto Rico, and the U.S. Virgin Islands, in 2013. Gaging s... Geological Survey (U.S.).
2012. Ritchie, Andrew C., Clahan, Kevin B., Johnson, Samuel Y., Pacific Coastal and Marine Science Center, and Golden, Nadine E. This line shapefile represents submarine landslide scarps of the geologic/geomorphic map of the Hueneme Canyon and surrounding vicinity in Californ... Geological Survey (U.S.).
2007, 2008, 2009, and 2010. Chin, John L., Johnson, Samuel Y., Ross, Stephanie L., Sliter, Ray W., and Golden, Nadine E. This line shapefile contains transgressive contours at 5 and 10 meter intervals for the areas within the 3-nautical mile limit between Bolinas and ... Geological Survey (U.S.).
2009. Watt, Janet T., Hartwell, Stephen R., Johnson, Samuel Y., Sliter, Ray W., and Pacific Coastal and Marine Science Center. This line shapefile contains transgressive contours at 5 and 10 meter intervals for the area within the 3-nautical mile limit between Salt Point an... Geological Survey (U.S.).