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National Geodetic Vertical Datum of 1929 - [coordinate systems] The datum established in 1929 by the U.S. Coast and Geodetic Survey as the surface against which elevation data in the United States is referenced.
[Category=Geospatial ]
Source: esri, 17 June 2012 08:22:00, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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