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Data maps of a specific theme connected with a specific geographic area, such as the Centers of the Population of the U.S. between 1790 and 2000. Statistical thematic maps include a variety of different map types such as choropleth or shaded maps, dot maps, proportional symbol maps, and isarithmic maps.
Interactive maps by the Census Bureau concentrate on business, demographic, economic, geographic, housing, trade, or other characteristics of a city, county, state, region, or the U.S.
Reference Maps include a variety of map types that show the boundaries and names of geographic areas for which the Census Bureau tabulates statistical data. Some types of reference maps include geographic features and their identifiers that are coincident with the boundary. Examples are roads and water features.
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