2000. U.S. Census Bureau. Geography Division. This polygon shapefile represents the unified school district boundaries in Nebraska. School districts are geographic entities within which state, ... U.S. Census Bureau. Geography Division.
1825. 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 ...
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. This polygon data layer represents the 2010 TIGER/Line voting districts for Nebraska. The TIGER/Line Files are shapefiles and related database file...