National Governors Association 
National Geospatial Agency 
National Gallery of Art 
National Geospatial-Intelligence Agenc… 
National Glass Association 
National Graphical Association 
NATO Guidelines Area 
Natural Gas Act 
Natural Gas Association 
NIGERIA 
Noise Gain Analyzer 
Notice of Grant Award 
NAD-glycohydrolase 
Naitonal Guard Area 
National Gallery of Australia 
National Geographical Association 
National Geospatial Intelligence Agenc… 
National Governor's Association 
National Governors' Association 
National Guard Association 
Natural Gas Act of 1938 
neuroglandular antigen 
Nigeria Airways 
NoGo anteriorisation 
NoGo-Anteriorization 
Non-Governmental Agency 
North American Galvanizing and Coating… 
Northeast Gas Association 
Northwest Geophysical Associates 
Nueva Gales del Sur