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2000. U.S. Census Bureau. Geography Division. This polygon shapefile represents the unified school district boundaries in Alabama. School districts are geographic entities within which state, c... U.S. Census Bureau. Geography Division.
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.