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SECURITY MEASURES
8
PERIODICALS
6
AIRPORTS
4
POLITICS AND GOVERNMENT
4
TERRORISM
4
AGRICULTURE
3
BUSINESS
3
COMPUTER NETWORK RESOURCES
3
ECONOMIC CONDITIONS
3
EXPLOSIVES
3
GOVERNMENT POLICY
3
INFORMATION TECHNOLOGY
3
INTERNATIONAL TRADE
3
LABOR
3
LAW AND LEGISLATION
3
MANAGEMENT
3
MEDICINE
3
POLITICAL SCIENCE
3
RESEARCH
3
STATISTICS
3
AERONAUTICS
2
AERONAUTICS, COMMERCIAL
2
AIRCRAFT CABINS
2
AIRPLANES
2
ARMED FORCES
2
BIOLOGICAL WARFARE
2
BOMBINGS
2
CIVIL DEFENSE
2
CLASSIFICATION, LIBRARY OF CONGRESS
2
COMMERCIAL STATISTICS
2
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