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USGS is a primary source of geographic information system (GIS) data. Our data and information is presented in spatial and geographic formats, including The National Map, Earth Explorer, GloVIS, LandsatLook, and much more. Explore GIS Data Maps. 

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The changing scene in surveying and mapping

Outlines progress in the last 40 yr, as the keynote address, 1979 ASP-ACSM Fall Technical Meeting, Sept. 17-20, Sioux Falls, S.D. -E.Williams