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- N,N-DIALKOXYUREAS 1
- N-ACYLNITRENIUM IONS 1
- narrow-purpose teaching manual 1
- national and democratic revolution 1
- national economy 2
- national environmental security 1
- national human rights institute 1
- national idea 2
- national legislation 2
- national security 1
- national security strategy 1
- national system of education 1
- natural sciences 2
- nature tourism 1
- navigation 5
- navigation data 3
- navigation situation 2
- navigation system and vessel management 2
- NAVY radar system 1
- navy surface 1