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2001. Geological Survey (U.S.). This data set includes a selection of urban areas in the United States derived from the urban areas layer of the Digital Chart of the World (DCW). ... Geological Survey (U.S.).
2004. National Atlas of the United States. This point shapefile includes Holocene volcanoes, which are those thought to be active in the last 10,000 years, that are within an extended area o... National Atlas of the United States.
2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This line shapefile depicts the boundaries of disputed areas and breakaway regions ranging from Kashmir to the Elemi Triangle and Northern Cyprus t... North American Cartographic Information Society.
2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This line shapefile depicts the boundaries of disputed areas and breakaway regions ranging from Kashmir to the Elemi Triangle and Northern Cyprus t... North American Cartographic Information Society.