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Subject: 20.1(0) Екологія в світі

Класифікатори (9825)
- ББK (9825)
  - 2 Природничі науки (Природознавство) (9501)
    - 20 Природничі науки в цілому. Природознавство в цілому (61)
      - 20.1 Екологія людини. Екологія в цілому (61)
        20.1(0) Екологія в світі

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This list was generated on Wed Nov 19 03:52:11 2025 EET.

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