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- Security classification (Government documents)31
- United States[remove]31
- Security measures6
- Official secrets5
- Officials and employees5
- Handbooks, manuals, etc4
- Law and legislation4
- Courts3
- Government information3
- Judicial process3
- National security3
- Auditing2
- Computer security2
- Evaluation2
- Records and correspondence2
- Access control1
- Appropriations and expenditures1
- Classified Information Procedures Act (United States)1
- Computer networks1
- Data processing1