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| Английский | Русский |
| code book | словарь кода (the complete set of terms included in a code Alex_Odeychuk) |
| code book for operational communications frequencies | кодовая книга частот оперативной связи (Alex_Odeychuk) |
| observation post log book | журнал разведки |
| off-the-book meeting | неофициальная встреча (Brit.E. Taras) |