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- Security classification (Government documents)5
- Amphibians as laboratory animals2
- Animals, Mythical2
- Cold War2
- Experiments2
- Fairy tales2
- Foreign relations2
- Laboratories2
- Mermen2
- Mute persons2
- Orphans2
- Politics and government2
- Science2
- Carías Andino, Tiburcio, 1876-19691
- Cold War (1945-1989)1
- Conspiracies1
- History1
- Manners and customs1
- Secret service1
- Social life and customs1