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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. MSC Mapping Science Committee NAD 83 North American Datum of 1983 NAPA National Academy of Public Administration NAS National Academy of Sciences NAVD 88 North American Vertical Datum of 1988 NCGIA National Center for Geographic Information and Analysis NDCDB National Digital Cartographic Data Base NDOP National Digital Orthophoto Program NILS National Integrated Land System NIMA National Imagery and Mapping Agency NMD National Mapping Division NMP National Mapping Program NOAA National Oceanic and Atmospheric Administration NRC National Research Council NRCan Natural Resources Canada NRCS Natural Resources Conservation Service NSDI National Spatial Data Infrastructure NSGIC National States Geographic Information Council OGC Open GIS Consortium OMB Office of Management and Budget TIGER Topologically Integrated Geographic Encoding and Referencing USDA United States Department of Agriculture USGS United States Geological Survey
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