National Association of REALTORS North American Rockwell National Association of Rocketry net assimilation rate Notice of Ammunition Reclassification Non-Advocacy Review Non-Advocate Review Northern Alberta Railways Nuclear Acoustic Resonance Numerical Analysis Research narrow National Asbestos Registry naval air reserve Network Access Register No Answer Required Noise Adding Radiometer North American Rayon North American Route North American Routes Notice of Ammunition Reclassifications Nucleic Acids Research Air Continental Inc Canadian National Railway Nagase analbuminaemic rats Nagase analbuminemia rats Nagase analbuminemic rat Nagase analbuminemic rats narcotic naringenin nasal airflow resistance