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Architecture Library Guide
A library guide supporting researchers in the design professions and in their communities
A collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation. Includes orthoimagery (aerial photographs), elevation, geographic names, hydrography, boundaries, transportation, structures, and land cover.
Social Explorer “contains over 18,000 maps, hundreds of profile reports, 40 billion data elements, 335,000 variables and 220 years of data”. It can be used to locate census tract boundary information from 1940 to the present.