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| исследование истории (The study of events in relation to their development over time; Изучение событий в зависимости от их развития во времени) | |||
| исторические исследования (Alex_Odeychuk); историческое исследование (Alex_Odeychuk) | |||
| historical research: 9 phrases in 4 subjects |
| Historical | 5 |
| Military | 2 |
| Philosophy | 1 |
| Scientific | 1 |