mult - Neph
- National Park Service
- national parks
- national parks and protected areas
- National Party
- National Party of South Africa
- National Portrait Gallery
- National Postal Museum
- National preserves
- National Primitive Baptist Convention, Inc.
- National Progressive party.
- National Public Radio
- National Public Radio (NPR)
- National Radio Astronomy Observatory
- National Railway Museum
- National Recovery Administration
- National Recovery Administration (NRA)
- National Recovery Administration.
- National recreation areas
- National Republican Party
- National Research Council
- National Review
- National Revolutionary Party
- National Rifle Association
- National Rifle Association (NRA)
- National Rifle Association of America
- National Roman Museum
- National Savings
- National Savings and Investments
- National Savings Certificate
- national scenic area
- national scenic trails
- National Science Foundation
- National Science Museum
- national seashore
- National Security Advisor
- National Security Agency
- National Security Agency (NSA)
- National Security Council
- National Security Council (NSC)
- national service
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