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2002. National Atlas of the United States. This line shapefile represents the Continental Divide of the United States. The map layer was created by extracting Hydrologic Unit Boundary line f... National Atlas of the United States.
2001. Godt, Jonathan W. This polygon shapefile shows point locations of costly individual landslide events in the 50 United States and Puerto Rico. Landslide locations wer... National Atlas of the United States.
2001. Godt, Jonathan W. This polygon shapefile contains information on costly regional landslide events in the 50 United States and Puerto Rico. The extents of the regiona... National Atlas of the United States.
1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, and 1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2001. Geological Survey (U.S.) Minerals Information Team. This point shapefile represents locations of crushed stone operations in the United States. These data were obtained from information reported volu... National Atlas of the United States.
1941, 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 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, 1998, 1999, and 2000. Lannoo, Michael J., Blackburn, Laura, and Nanjappa, Priya. This polygon shapefile portrays the distribution of 10 selected amphibians in the United States, based on historical literature and museum records ... National Atlas of the United States.
1984. Tobin, B. D. and Weary, David J. This polygon shapefile is a digital version of U.S. Geological Survey Open File Report 2004-1352, Engineering Aspects of Karst. The open-file repor... National Atlas of the United States.
2005. Reed, John Calvin, Jr. 1930- and Bush, Charles A. This line shapefile represents major fault lines in Alaska. This map complements the Generalized Geologic Map of the Conterminous United States by ... Geological Survey (U.S.) and National Atlas of the United States.