Publisher
- National Aeronautics and Space Council12
- National Agricultural Library67
- National Air Museum4
- National Air Pollution Control Administration79
- National Air and Space Museum13
- National Archives269
- National Archives and Records Service1
- National Archives and Records Services753
- National Association of Railway Commissioners1
- National Banks Select Committee (Senate)1
- National Bark Service3
- National Bituminous Coal Commission95
- National Board for Promotion of Rifle Practice40
- National Botanic Garden15
- National Botanic Garden Library Joint Committee1
- National Bureau of Standards6,393
- National Business Council for Consumer Affairs13
- National Cancer Institute126
- National Capital Airports Bureau5
- National Capital Housing Authority9