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- Security classification (Government documents)5
- Amphibians as laboratory animals2
- Animals, Mythical2
- Cold War2
- Experiments2
- Fairy tales2
- Government information2
- Laboratories2
- Mermen2
- Mute persons2
- Orphans2
- Science2
- Cold War (1945-1989)1
- Democracy1
- History1
- Manners and customs1
- Official secrets1
- Social life and customs1
- Terrorism1