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| natural-technological disaster (Rus: most hits MichaelBurov); natech disaster (Rus: most hits MichaelBurov); na-tech disaster (Rus: most hits MichaelBurov); natural-technological hazard (Rus: most hits MichaelBurov); natech hazard (Rus: most hits MichaelBurov); na-tech hazard (Rus: most hits MichaelBurov) | |||
| природно-техногенная катастрофа: 5 a las frases, 1 temas |
| Sistemas de seguridad | 5 |