The topological structure of the Census TIGER database defines
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the location and relationship of streets, rivers, railroads, and other features to each other and to the numerous geographic entities for which the Census Bureau tabulates data from its censuses and sample surveys.
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This data is freely accessible to the public, and
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based on an open architecture that allows other Web developers and publishers to use public domain maps generated by this service in their own applications.
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The Census database also includes
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social, demographic and Economic Information. Census data is freely available over the Web.
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