2000. U.S. Department of Commerce, Bureau of the Census, Geography Division. The polygons in this datalayer represent ZIP Code Tabulation Areas (ZCTAs) for the entire state. ZCTAs are a new statistical entity developed by t... U.S. Department of Commerce, Bureau of the Census.
1825. Harvard Map Collection, Harvard College Library. This layer is a georeferenced raster image of the historic paper map entitled: Map of the United States of North America, compiled from the latest ... Harvard Map Collection, Harvard College Library.
2011. United States. Bureau of Transportation Statistics. This data set includes cities in the United States, Puerto Rico and the U.S. Virgin Islands. These cities were collected from the 1970 National Atl... U.S. Geological Survey.
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.
2010. U.S. Census Bureau. Geography Division. This polygon data layer represents the 2010 TIGER/Line voting districts for Louisiana. The TIGER/Line Files are shapefiles and related database fil...